Time Arithmetic

A benchmark to evaluate a model's ability to add and subtract durations from clock times in 24-hour HH:MM format.

Run Benchmark
Questions

40

Leaderboard Entries

27

Best Score

100/100

Leaderboard
Rank Model Score Run Date Actions
GPT-5.4 nano
100
702.0ms median
 2026-03-17 19:18:29 View Details
2 GPT-5.4 mini
100
712.5ms median
 2026-03-17 18:56:14 View Details
3 Claude Haiku 4.5
100
612.0ms median
 2026-03-03 05:54:41 View Details
4 GPT-5 mini
100
1129.5ms median
 2026-02-26 01:21:22 View Details
5 Phi-4 (LMStudio)
9100 MB
90
1339.0ms median
 2026-03-03 00:53:50 View Details
6 Qwen3.5 9B (LMStudio)
6600 MB
85
1493.0ms median
 2026-03-03 19:59:42 View Details
7 GPT-5 nano
82
1021.0ms median
 2026-02-26 00:53:11 View Details
8 Gemma 4 E4B IT (LMStudio)
3200 MB
78
801.0ms median
 2026-04-02 21:00:09 View Details
9 Qwen3 VL 8B (LMStudio)
5000 MB
75
3312.5ms median
 2026-02-28 18:47:19 View Details
10 Gemma 4 12B (LMStudio)
7560 MB
70
1986.5ms median
 2026-06-03 18:54:21 View Details
11 Gemma 3 12B (LMStudio)
8100 MB
70
1704.0ms median
 2026-02-28 15:56:41 View Details
12 Gemma 2 9B (LMStudio)
5800 MB
70
1012.5ms median
 2026-02-28 15:03:00 View Details
13 Qwen3.5 4B (LMStudio)
3400 MB
65
1153.5ms median
 2026-03-03 21:04:59 View Details
14 Qwen3 4B (LMStudio)
2800 MB
65
487.0ms median
 2026-02-28 18:14:36 View Details
15 OLMo 3 7B (LMStudio)
4300 MB
65
518.0ms median
 2026-02-28 17:38:31 View Details
16 Llama 3 8B (LMStudio)
4900 MB
65
580.5ms median
 2026-02-28 16:47:56 View Details
17 Granite 3.2 8B (LMStudio)
4900 MB
60
917.5ms median
 2026-02-28 16:20:34 View Details
18 Ministral 8B (LMStudio)
4900 MB
55
695.0ms median
 2026-02-28 17:24:41 View Details
19 Llama 3.1 8B (LMStudio)
4900 MB
55
706.0ms median
 2026-02-28 17:03:25 View Details
20 Qwen3.5 2B (LMStudio)
2700 MB
40
528.0ms median
 2026-03-03 19:22:20 View Details
21 Gemma 2 2B (LMStudio)
1500 MB
35
830.5ms median
 2026-02-28 03:24:34 View Details
22 Qwen3 1.7B (LMStudio)
1100 MB
28
249.5ms median
 2026-02-28 18:06:02 View Details
23 Llama 2 7B (LMStudio)
4900 MB
18
863.0ms median
 2026-02-28 03:09:28 View Details
24 Gemma 2B (LMStudio)
1500 MB
8
433.5ms median
 2026-02-28 15:35:54 View Details
25 SmolLM2 1.7B (LMStudio)
1100 MB
5
274.5ms median
 2026-02-28 19:20:02 View Details
26 Llama 3.2 1B (LMStudio)
1300 MB
2
257.5ms median
 2026-02-28 17:13:43 View Details
27 Phi-3.5 Mini (LMStudio)
2500 MB
0
452.0ms median
 2026-02-28 17:50:37 View Details
Questions

Question
Starting at 22:00, what time was it 40 minutes earlier? Return HH:MM in 24-hour format.
Question payload
{
  "question_text": "Starting at 22:00, what time was it 40 minutes earlier? Return HH:MM in 24-hour format.",
  "answer_type": "free_text",
  "correct_answer": "21:20",
  "category": "time_arithmetic",
  "difficulty": "easy",
  "tags": [
    "time",
    "arithmetic",
    "subtraction"
  ],
  "schema": {
    "type": "object",
    "properties": {
      "time": {
        "type": "string",
        "description": "Computed clock time in HH:MM 24-hour format"
      }
    },
    "required": [
      "time"
    ]
  },
  "evaluation_criteria": {
    "exact_match": true,
    "case_sensitive": false,
    "contains": false,
    "required_fields": [],
    "tolerance": 0.0,
    "alternatives": []
  }
}

Question
Starting at 16:00, what time was it 10 minutes earlier? Return HH:MM in 24-hour format.
Question payload
{
  "question_text": "Starting at 16:00, what time was it 10 minutes earlier? Return HH:MM in 24-hour format.",
  "answer_type": "free_text",
  "correct_answer": "15:50",
  "category": "time_arithmetic",
  "difficulty": "easy",
  "tags": [
    "time",
    "arithmetic",
    "subtraction"
  ],
  "schema": {
    "type": "object",
    "properties": {
      "time": {
        "type": "string",
        "description": "Computed clock time in HH:MM 24-hour format"
      }
    },
    "required": [
      "time"
    ]
  },
  "evaluation_criteria": {
    "exact_match": true,
    "case_sensitive": false,
    "contains": false,
    "required_fields": [],
    "tolerance": 0.0,
    "alternatives": []
  }
}

Question
Starting at 12:05, what time was it 5 minutes earlier? Return HH:MM in 24-hour format.
Question payload
{
  "question_text": "Starting at 12:05, what time was it 5 minutes earlier? Return HH:MM in 24-hour format.",
  "answer_type": "free_text",
  "correct_answer": "12:00",
  "category": "time_arithmetic",
  "difficulty": "easy",
  "tags": [
    "time",
    "arithmetic",
    "subtraction"
  ],
  "schema": {
    "type": "object",
    "properties": {
      "time": {
        "type": "string",
        "description": "Computed clock time in HH:MM 24-hour format"
      }
    },
    "required": [
      "time"
    ]
  },
  "evaluation_criteria": {
    "exact_match": true,
    "case_sensitive": false,
    "contains": false,
    "required_fields": [],
    "tolerance": 0.0,
    "alternatives": []
  }
}

Question
Starting at 15:35, what time was it 75 minutes earlier? Return HH:MM in 24-hour format.
Question payload
{
  "question_text": "Starting at 15:35, what time was it 75 minutes earlier? Return HH:MM in 24-hour format.",
  "answer_type": "free_text",
  "correct_answer": "14:20",
  "category": "time_arithmetic",
  "difficulty": "medium",
  "tags": [
    "time",
    "arithmetic",
    "subtraction"
  ],
  "schema": {
    "type": "object",
    "properties": {
      "time": {
        "type": "string",
        "description": "Computed clock time in HH:MM 24-hour format"
      }
    },
    "required": [
      "time"
    ]
  },
  "evaluation_criteria": {
    "exact_match": true,
    "case_sensitive": false,
    "contains": false,
    "required_fields": [],
    "tolerance": 0.0,
    "alternatives": []
  }
}

Question
Starting at 03:55, what time was it 10 minutes earlier? Return HH:MM in 24-hour format.
Question payload
{
  "question_text": "Starting at 03:55, what time was it 10 minutes earlier? Return HH:MM in 24-hour format.",
  "answer_type": "free_text",
  "correct_answer": "03:45",
  "category": "time_arithmetic",
  "difficulty": "easy",
  "tags": [
    "time",
    "arithmetic",
    "subtraction"
  ],
  "schema": {
    "type": "object",
    "properties": {
      "time": {
        "type": "string",
        "description": "Computed clock time in HH:MM 24-hour format"
      }
    },
    "required": [
      "time"
    ]
  },
  "evaluation_criteria": {
    "exact_match": true,
    "case_sensitive": false,
    "contains": false,
    "required_fields": [],
    "tolerance": 0.0,
    "alternatives": []
  }
}

Question
Starting at 02:50, what time was it 50 minutes earlier? Return HH:MM in 24-hour format.
Question payload
{
  "question_text": "Starting at 02:50, what time was it 50 minutes earlier? Return HH:MM in 24-hour format.",
  "answer_type": "free_text",
  "correct_answer": "02:00",
  "category": "time_arithmetic",
  "difficulty": "medium",
  "tags": [
    "time",
    "arithmetic",
    "subtraction"
  ],
  "schema": {
    "type": "object",
    "properties": {
      "time": {
        "type": "string",
        "description": "Computed clock time in HH:MM 24-hour format"
      }
    },
    "required": [
      "time"
    ]
  },
  "evaluation_criteria": {
    "exact_match": true,
    "case_sensitive": false,
    "contains": false,
    "required_fields": [],
    "tolerance": 0.0,
    "alternatives": []
  }
}

Question
Starting at 10:25, what time was it 15 minutes earlier? Return HH:MM in 24-hour format.
Question payload
{
  "question_text": "Starting at 10:25, what time was it 15 minutes earlier? Return HH:MM in 24-hour format.",
  "answer_type": "free_text",
  "correct_answer": "10:10",
  "category": "time_arithmetic",
  "difficulty": "easy",
  "tags": [
    "time",
    "arithmetic",
    "subtraction"
  ],
  "schema": {
    "type": "object",
    "properties": {
      "time": {
        "type": "string",
        "description": "Computed clock time in HH:MM 24-hour format"
      }
    },
    "required": [
      "time"
    ]
  },
  "evaluation_criteria": {
    "exact_match": true,
    "case_sensitive": false,
    "contains": false,
    "required_fields": [],
    "tolerance": 0.0,
    "alternatives": []
  }
}

Question
Starting at 04:55, what time was it 90 minutes earlier? Return HH:MM in 24-hour format.
Question payload
{
  "question_text": "Starting at 04:55, what time was it 90 minutes earlier? Return HH:MM in 24-hour format.",
  "answer_type": "free_text",
  "correct_answer": "03:25",
  "category": "time_arithmetic",
  "difficulty": "medium",
  "tags": [
    "time",
    "arithmetic",
    "subtraction"
  ],
  "schema": {
    "type": "object",
    "properties": {
      "time": {
        "type": "string",
        "description": "Computed clock time in HH:MM 24-hour format"
      }
    },
    "required": [
      "time"
    ]
  },
  "evaluation_criteria": {
    "exact_match": true,
    "case_sensitive": false,
    "contains": false,
    "required_fields": [],
    "tolerance": 0.0,
    "alternatives": []
  }
}

Question
Starting at 21:10, what time is it after 60 minutes? Return HH:MM in 24-hour format.
Question payload
{
  "question_text": "Starting at 21:10, what time is it after 60 minutes? Return HH:MM in 24-hour format.",
  "answer_type": "free_text",
  "correct_answer": "22:10",
  "category": "time_arithmetic",
  "difficulty": "medium",
  "tags": [
    "time",
    "arithmetic",
    "addition"
  ],
  "schema": {
    "type": "object",
    "properties": {
      "time": {
        "type": "string",
        "description": "Computed clock time in HH:MM 24-hour format"
      }
    },
    "required": [
      "time"
    ]
  },
  "evaluation_criteria": {
    "exact_match": true,
    "case_sensitive": false,
    "contains": false,
    "required_fields": [],
    "tolerance": 0.0,
    "alternatives": []
  }
}

Question
Starting at 19:50, what time is it after 90 minutes? Return HH:MM in 24-hour format.
Question payload
{
  "question_text": "Starting at 19:50, what time is it after 90 minutes? Return HH:MM in 24-hour format.",
  "answer_type": "free_text",
  "correct_answer": "21:20",
  "category": "time_arithmetic",
  "difficulty": "medium",
  "tags": [
    "time",
    "arithmetic",
    "addition"
  ],
  "schema": {
    "type": "object",
    "properties": {
      "time": {
        "type": "string",
        "description": "Computed clock time in HH:MM 24-hour format"
      }
    },
    "required": [
      "time"
    ]
  },
  "evaluation_criteria": {
    "exact_match": true,
    "case_sensitive": false,
    "contains": false,
    "required_fields": [],
    "tolerance": 0.0,
    "alternatives": []
  }
}

Question
Starting at 22:45, what time is it after 60 minutes? Return HH:MM in 24-hour format.
Question payload
{
  "question_text": "Starting at 22:45, what time is it after 60 minutes? Return HH:MM in 24-hour format.",
  "answer_type": "free_text",
  "correct_answer": "23:45",
  "category": "time_arithmetic",
  "difficulty": "medium",
  "tags": [
    "time",
    "arithmetic",
    "addition"
  ],
  "schema": {
    "type": "object",
    "properties": {
      "time": {
        "type": "string",
        "description": "Computed clock time in HH:MM 24-hour format"
      }
    },
    "required": [
      "time"
    ]
  },
  "evaluation_criteria": {
    "exact_match": true,
    "case_sensitive": false,
    "contains": false,
    "required_fields": [],
    "tolerance": 0.0,
    "alternatives": []
  }
}

Question
Starting at 02:45, what time is it after 40 minutes? Return HH:MM in 24-hour format.
Question payload
{
  "question_text": "Starting at 02:45, what time is it after 40 minutes? Return HH:MM in 24-hour format.",
  "answer_type": "free_text",
  "correct_answer": "03:25",
  "category": "time_arithmetic",
  "difficulty": "easy",
  "tags": [
    "time",
    "arithmetic",
    "addition"
  ],
  "schema": {
    "type": "object",
    "properties": {
      "time": {
        "type": "string",
        "description": "Computed clock time in HH:MM 24-hour format"
      }
    },
    "required": [
      "time"
    ]
  },
  "evaluation_criteria": {
    "exact_match": true,
    "case_sensitive": false,
    "contains": false,
    "required_fields": [],
    "tolerance": 0.0,
    "alternatives": []
  }
}

Question
Starting at 16:35, what time was it 40 minutes earlier? Return HH:MM in 24-hour format.
Question payload
{
  "question_text": "Starting at 16:35, what time was it 40 minutes earlier? Return HH:MM in 24-hour format.",
  "answer_type": "free_text",
  "correct_answer": "15:55",
  "category": "time_arithmetic",
  "difficulty": "easy",
  "tags": [
    "time",
    "arithmetic",
    "subtraction"
  ],
  "schema": {
    "type": "object",
    "properties": {
      "time": {
        "type": "string",
        "description": "Computed clock time in HH:MM 24-hour format"
      }
    },
    "required": [
      "time"
    ]
  },
  "evaluation_criteria": {
    "exact_match": true,
    "case_sensitive": false,
    "contains": false,
    "required_fields": [],
    "tolerance": 0.0,
    "alternatives": []
  }
}

Question
Starting at 09:55, what time was it 135 minutes earlier? Return HH:MM in 24-hour format.
Question payload
{
  "question_text": "Starting at 09:55, what time was it 135 minutes earlier? Return HH:MM in 24-hour format.",
  "answer_type": "free_text",
  "correct_answer": "07:40",
  "category": "time_arithmetic",
  "difficulty": "hard",
  "tags": [
    "time",
    "arithmetic",
    "subtraction"
  ],
  "schema": {
    "type": "object",
    "properties": {
      "time": {
        "type": "string",
        "description": "Computed clock time in HH:MM 24-hour format"
      }
    },
    "required": [
      "time"
    ]
  },
  "evaluation_criteria": {
    "exact_match": true,
    "case_sensitive": false,
    "contains": false,
    "required_fields": [],
    "tolerance": 0.0,
    "alternatives": []
  }
}

Question
Starting at 09:20, what time is it after 45 minutes? Return HH:MM in 24-hour format.
Question payload
{
  "question_text": "Starting at 09:20, what time is it after 45 minutes? Return HH:MM in 24-hour format.",
  "answer_type": "free_text",
  "correct_answer": "10:05",
  "category": "time_arithmetic",
  "difficulty": "easy",
  "tags": [
    "time",
    "arithmetic",
    "addition"
  ],
  "schema": {
    "type": "object",
    "properties": {
      "time": {
        "type": "string",
        "description": "Computed clock time in HH:MM 24-hour format"
      }
    },
    "required": [
      "time"
    ]
  },
  "evaluation_criteria": {
    "exact_match": true,
    "case_sensitive": false,
    "contains": false,
    "required_fields": [],
    "tolerance": 0.0,
    "alternatives": []
  }
}

Question
Starting at 19:10, what time is it after 5 minutes? Return HH:MM in 24-hour format.
Question payload
{
  "question_text": "Starting at 19:10, what time is it after 5 minutes? Return HH:MM in 24-hour format.",
  "answer_type": "free_text",
  "correct_answer": "19:15",
  "category": "time_arithmetic",
  "difficulty": "easy",
  "tags": [
    "time",
    "arithmetic",
    "addition"
  ],
  "schema": {
    "type": "object",
    "properties": {
      "time": {
        "type": "string",
        "description": "Computed clock time in HH:MM 24-hour format"
      }
    },
    "required": [
      "time"
    ]
  },
  "evaluation_criteria": {
    "exact_match": true,
    "case_sensitive": false,
    "contains": false,
    "required_fields": [],
    "tolerance": 0.0,
    "alternatives": []
  }
}

Question
Starting at 03:15, what time is it after 90 minutes? Return HH:MM in 24-hour format.
Question payload
{
  "question_text": "Starting at 03:15, what time is it after 90 minutes? Return HH:MM in 24-hour format.",
  "answer_type": "free_text",
  "correct_answer": "04:45",
  "category": "time_arithmetic",
  "difficulty": "medium",
  "tags": [
    "time",
    "arithmetic",
    "addition"
  ],
  "schema": {
    "type": "object",
    "properties": {
      "time": {
        "type": "string",
        "description": "Computed clock time in HH:MM 24-hour format"
      }
    },
    "required": [
      "time"
    ]
  },
  "evaluation_criteria": {
    "exact_match": true,
    "case_sensitive": false,
    "contains": false,
    "required_fields": [],
    "tolerance": 0.0,
    "alternatives": []
  }
}

Question
Starting at 18:55, what time is it after 35 minutes? Return HH:MM in 24-hour format.
Question payload
{
  "question_text": "Starting at 18:55, what time is it after 35 minutes? Return HH:MM in 24-hour format.",
  "answer_type": "free_text",
  "correct_answer": "19:30",
  "category": "time_arithmetic",
  "difficulty": "easy",
  "tags": [
    "time",
    "arithmetic",
    "addition"
  ],
  "schema": {
    "type": "object",
    "properties": {
      "time": {
        "type": "string",
        "description": "Computed clock time in HH:MM 24-hour format"
      }
    },
    "required": [
      "time"
    ]
  },
  "evaluation_criteria": {
    "exact_match": true,
    "case_sensitive": false,
    "contains": false,
    "required_fields": [],
    "tolerance": 0.0,
    "alternatives": []
  }
}

Question
Starting at 22:50, what time is it after 90 minutes? Return HH:MM in 24-hour format.
Question payload
{
  "question_text": "Starting at 22:50, what time is it after 90 minutes? Return HH:MM in 24-hour format.",
  "answer_type": "free_text",
  "correct_answer": "00:20",
  "category": "time_arithmetic",
  "difficulty": "medium",
  "tags": [
    "time",
    "arithmetic",
    "addition"
  ],
  "schema": {
    "type": "object",
    "properties": {
      "time": {
        "type": "string",
        "description": "Computed clock time in HH:MM 24-hour format"
      }
    },
    "required": [
      "time"
    ]
  },
  "evaluation_criteria": {
    "exact_match": true,
    "case_sensitive": false,
    "contains": false,
    "required_fields": [],
    "tolerance": 0.0,
    "alternatives": []
  }
}

Question
Starting at 06:40, what time is it after 90 minutes? Return HH:MM in 24-hour format.
Question payload
{
  "question_text": "Starting at 06:40, what time is it after 90 minutes? Return HH:MM in 24-hour format.",
  "answer_type": "free_text",
  "correct_answer": "08:10",
  "category": "time_arithmetic",
  "difficulty": "medium",
  "tags": [
    "time",
    "arithmetic",
    "addition"
  ],
  "schema": {
    "type": "object",
    "properties": {
      "time": {
        "type": "string",
        "description": "Computed clock time in HH:MM 24-hour format"
      }
    },
    "required": [
      "time"
    ]
  },
  "evaluation_criteria": {
    "exact_match": true,
    "case_sensitive": false,
    "contains": false,
    "required_fields": [],
    "tolerance": 0.0,
    "alternatives": []
  }
}

Question
Starting at 23:40, what time was it 135 minutes earlier? Return HH:MM in 24-hour format.
Question payload
{
  "question_text": "Starting at 23:40, what time was it 135 minutes earlier? Return HH:MM in 24-hour format.",
  "answer_type": "free_text",
  "correct_answer": "21:25",
  "category": "time_arithmetic",
  "difficulty": "hard",
  "tags": [
    "time",
    "arithmetic",
    "subtraction"
  ],
  "schema": {
    "type": "object",
    "properties": {
      "time": {
        "type": "string",
        "description": "Computed clock time in HH:MM 24-hour format"
      }
    },
    "required": [
      "time"
    ]
  },
  "evaluation_criteria": {
    "exact_match": true,
    "case_sensitive": false,
    "contains": false,
    "required_fields": [],
    "tolerance": 0.0,
    "alternatives": []
  }
}

Question
Starting at 01:15, what time was it 20 minutes earlier? Return HH:MM in 24-hour format.
Question payload
{
  "question_text": "Starting at 01:15, what time was it 20 minutes earlier? Return HH:MM in 24-hour format.",
  "answer_type": "free_text",
  "correct_answer": "00:55",
  "category": "time_arithmetic",
  "difficulty": "easy",
  "tags": [
    "time",
    "arithmetic",
    "subtraction"
  ],
  "schema": {
    "type": "object",
    "properties": {
      "time": {
        "type": "string",
        "description": "Computed clock time in HH:MM 24-hour format"
      }
    },
    "required": [
      "time"
    ]
  },
  "evaluation_criteria": {
    "exact_match": true,
    "case_sensitive": false,
    "contains": false,
    "required_fields": [],
    "tolerance": 0.0,
    "alternatives": []
  }
}

Question
Starting at 17:50, what time was it 75 minutes earlier? Return HH:MM in 24-hour format.
Question payload
{
  "question_text": "Starting at 17:50, what time was it 75 minutes earlier? Return HH:MM in 24-hour format.",
  "answer_type": "free_text",
  "correct_answer": "16:35",
  "category": "time_arithmetic",
  "difficulty": "medium",
  "tags": [
    "time",
    "arithmetic",
    "subtraction"
  ],
  "schema": {
    "type": "object",
    "properties": {
      "time": {
        "type": "string",
        "description": "Computed clock time in HH:MM 24-hour format"
      }
    },
    "required": [
      "time"
    ]
  },
  "evaluation_criteria": {
    "exact_match": true,
    "case_sensitive": false,
    "contains": false,
    "required_fields": [],
    "tolerance": 0.0,
    "alternatives": []
  }
}

Question
Starting at 19:40, what time is it after 15 minutes? Return HH:MM in 24-hour format.
Question payload
{
  "question_text": "Starting at 19:40, what time is it after 15 minutes? Return HH:MM in 24-hour format.",
  "answer_type": "free_text",
  "correct_answer": "19:55",
  "category": "time_arithmetic",
  "difficulty": "easy",
  "tags": [
    "time",
    "arithmetic",
    "addition"
  ],
  "schema": {
    "type": "object",
    "properties": {
      "time": {
        "type": "string",
        "description": "Computed clock time in HH:MM 24-hour format"
      }
    },
    "required": [
      "time"
    ]
  },
  "evaluation_criteria": {
    "exact_match": true,
    "case_sensitive": false,
    "contains": false,
    "required_fields": [],
    "tolerance": 0.0,
    "alternatives": []
  }
}

Question
Starting at 16:05, what time was it 45 minutes earlier? Return HH:MM in 24-hour format.
Question payload
{
  "question_text": "Starting at 16:05, what time was it 45 minutes earlier? Return HH:MM in 24-hour format.",
  "answer_type": "free_text",
  "correct_answer": "15:20",
  "category": "time_arithmetic",
  "difficulty": "easy",
  "tags": [
    "time",
    "arithmetic",
    "subtraction"
  ],
  "schema": {
    "type": "object",
    "properties": {
      "time": {
        "type": "string",
        "description": "Computed clock time in HH:MM 24-hour format"
      }
    },
    "required": [
      "time"
    ]
  },
  "evaluation_criteria": {
    "exact_match": true,
    "case_sensitive": false,
    "contains": false,
    "required_fields": [],
    "tolerance": 0.0,
    "alternatives": []
  }
}

Question
Starting at 00:45, what time was it 20 minutes earlier? Return HH:MM in 24-hour format.
Question payload
{
  "question_text": "Starting at 00:45, what time was it 20 minutes earlier? Return HH:MM in 24-hour format.",
  "answer_type": "free_text",
  "correct_answer": "00:25",
  "category": "time_arithmetic",
  "difficulty": "easy",
  "tags": [
    "time",
    "arithmetic",
    "subtraction"
  ],
  "schema": {
    "type": "object",
    "properties": {
      "time": {
        "type": "string",
        "description": "Computed clock time in HH:MM 24-hour format"
      }
    },
    "required": [
      "time"
    ]
  },
  "evaluation_criteria": {
    "exact_match": true,
    "case_sensitive": false,
    "contains": false,
    "required_fields": [],
    "tolerance": 0.0,
    "alternatives": []
  }
}

Question
Starting at 03:35, what time was it 50 minutes earlier? Return HH:MM in 24-hour format.
Question payload
{
  "question_text": "Starting at 03:35, what time was it 50 minutes earlier? Return HH:MM in 24-hour format.",
  "answer_type": "free_text",
  "correct_answer": "02:45",
  "category": "time_arithmetic",
  "difficulty": "medium",
  "tags": [
    "time",
    "arithmetic",
    "subtraction"
  ],
  "schema": {
    "type": "object",
    "properties": {
      "time": {
        "type": "string",
        "description": "Computed clock time in HH:MM 24-hour format"
      }
    },
    "required": [
      "time"
    ]
  },
  "evaluation_criteria": {
    "exact_match": true,
    "case_sensitive": false,
    "contains": false,
    "required_fields": [],
    "tolerance": 0.0,
    "alternatives": []
  }
}

Question
Starting at 14:45, what time was it 50 minutes earlier? Return HH:MM in 24-hour format.
Question payload
{
  "question_text": "Starting at 14:45, what time was it 50 minutes earlier? Return HH:MM in 24-hour format.",
  "answer_type": "free_text",
  "correct_answer": "13:55",
  "category": "time_arithmetic",
  "difficulty": "medium",
  "tags": [
    "time",
    "arithmetic",
    "subtraction"
  ],
  "schema": {
    "type": "object",
    "properties": {
      "time": {
        "type": "string",
        "description": "Computed clock time in HH:MM 24-hour format"
      }
    },
    "required": [
      "time"
    ]
  },
  "evaluation_criteria": {
    "exact_match": true,
    "case_sensitive": false,
    "contains": false,
    "required_fields": [],
    "tolerance": 0.0,
    "alternatives": []
  }
}

Question
Starting at 02:10, what time is it after 35 minutes? Return HH:MM in 24-hour format.
Question payload
{
  "question_text": "Starting at 02:10, what time is it after 35 minutes? Return HH:MM in 24-hour format.",
  "answer_type": "free_text",
  "correct_answer": "02:45",
  "category": "time_arithmetic",
  "difficulty": "easy",
  "tags": [
    "time",
    "arithmetic",
    "addition"
  ],
  "schema": {
    "type": "object",
    "properties": {
      "time": {
        "type": "string",
        "description": "Computed clock time in HH:MM 24-hour format"
      }
    },
    "required": [
      "time"
    ]
  },
  "evaluation_criteria": {
    "exact_match": true,
    "case_sensitive": false,
    "contains": false,
    "required_fields": [],
    "tolerance": 0.0,
    "alternatives": []
  }
}

Question
Starting at 11:00, what time is it after 40 minutes? Return HH:MM in 24-hour format.
Question payload
{
  "question_text": "Starting at 11:00, what time is it after 40 minutes? Return HH:MM in 24-hour format.",
  "answer_type": "free_text",
  "correct_answer": "11:40",
  "category": "time_arithmetic",
  "difficulty": "easy",
  "tags": [
    "time",
    "arithmetic",
    "addition"
  ],
  "schema": {
    "type": "object",
    "properties": {
      "time": {
        "type": "string",
        "description": "Computed clock time in HH:MM 24-hour format"
      }
    },
    "required": [
      "time"
    ]
  },
  "evaluation_criteria": {
    "exact_match": true,
    "case_sensitive": false,
    "contains": false,
    "required_fields": [],
    "tolerance": 0.0,
    "alternatives": []
  }
}

Question
Starting at 09:25, what time is it after 45 minutes? Return HH:MM in 24-hour format.
Question payload
{
  "question_text": "Starting at 09:25, what time is it after 45 minutes? Return HH:MM in 24-hour format.",
  "answer_type": "free_text",
  "correct_answer": "10:10",
  "category": "time_arithmetic",
  "difficulty": "easy",
  "tags": [
    "time",
    "arithmetic",
    "addition"
  ],
  "schema": {
    "type": "object",
    "properties": {
      "time": {
        "type": "string",
        "description": "Computed clock time in HH:MM 24-hour format"
      }
    },
    "required": [
      "time"
    ]
  },
  "evaluation_criteria": {
    "exact_match": true,
    "case_sensitive": false,
    "contains": false,
    "required_fields": [],
    "tolerance": 0.0,
    "alternatives": []
  }
}

Question
Starting at 07:45, what time is it after 75 minutes? Return HH:MM in 24-hour format.
Question payload
{
  "question_text": "Starting at 07:45, what time is it after 75 minutes? Return HH:MM in 24-hour format.",
  "answer_type": "free_text",
  "correct_answer": "09:00",
  "category": "time_arithmetic",
  "difficulty": "medium",
  "tags": [
    "time",
    "arithmetic",
    "addition"
  ],
  "schema": {
    "type": "object",
    "properties": {
      "time": {
        "type": "string",
        "description": "Computed clock time in HH:MM 24-hour format"
      }
    },
    "required": [
      "time"
    ]
  },
  "evaluation_criteria": {
    "exact_match": true,
    "case_sensitive": false,
    "contains": false,
    "required_fields": [],
    "tolerance": 0.0,
    "alternatives": []
  }
}

Question
Starting at 11:05, what time is it after 75 minutes? Return HH:MM in 24-hour format.
Question payload
{
  "question_text": "Starting at 11:05, what time is it after 75 minutes? Return HH:MM in 24-hour format.",
  "answer_type": "free_text",
  "correct_answer": "12:20",
  "category": "time_arithmetic",
  "difficulty": "medium",
  "tags": [
    "time",
    "arithmetic",
    "addition"
  ],
  "schema": {
    "type": "object",
    "properties": {
      "time": {
        "type": "string",
        "description": "Computed clock time in HH:MM 24-hour format"
      }
    },
    "required": [
      "time"
    ]
  },
  "evaluation_criteria": {
    "exact_match": true,
    "case_sensitive": false,
    "contains": false,
    "required_fields": [],
    "tolerance": 0.0,
    "alternatives": []
  }
}

Question
Starting at 06:35, what time was it 10 minutes earlier? Return HH:MM in 24-hour format.
Question payload
{
  "question_text": "Starting at 06:35, what time was it 10 minutes earlier? Return HH:MM in 24-hour format.",
  "answer_type": "free_text",
  "correct_answer": "06:25",
  "category": "time_arithmetic",
  "difficulty": "easy",
  "tags": [
    "time",
    "arithmetic",
    "subtraction"
  ],
  "schema": {
    "type": "object",
    "properties": {
      "time": {
        "type": "string",
        "description": "Computed clock time in HH:MM 24-hour format"
      }
    },
    "required": [
      "time"
    ]
  },
  "evaluation_criteria": {
    "exact_match": true,
    "case_sensitive": false,
    "contains": false,
    "required_fields": [],
    "tolerance": 0.0,
    "alternatives": []
  }
}

Question
Starting at 02:55, what time was it 15 minutes earlier? Return HH:MM in 24-hour format.
Question payload
{
  "question_text": "Starting at 02:55, what time was it 15 minutes earlier? Return HH:MM in 24-hour format.",
  "answer_type": "free_text",
  "correct_answer": "02:40",
  "category": "time_arithmetic",
  "difficulty": "easy",
  "tags": [
    "time",
    "arithmetic",
    "subtraction"
  ],
  "schema": {
    "type": "object",
    "properties": {
      "time": {
        "type": "string",
        "description": "Computed clock time in HH:MM 24-hour format"
      }
    },
    "required": [
      "time"
    ]
  },
  "evaluation_criteria": {
    "exact_match": true,
    "case_sensitive": false,
    "contains": false,
    "required_fields": [],
    "tolerance": 0.0,
    "alternatives": []
  }
}

Question
Starting at 21:20, what time is it after 35 minutes? Return HH:MM in 24-hour format.
Question payload
{
  "question_text": "Starting at 21:20, what time is it after 35 minutes? Return HH:MM in 24-hour format.",
  "answer_type": "free_text",
  "correct_answer": "21:55",
  "category": "time_arithmetic",
  "difficulty": "easy",
  "tags": [
    "time",
    "arithmetic",
    "addition"
  ],
  "schema": {
    "type": "object",
    "properties": {
      "time": {
        "type": "string",
        "description": "Computed clock time in HH:MM 24-hour format"
      }
    },
    "required": [
      "time"
    ]
  },
  "evaluation_criteria": {
    "exact_match": true,
    "case_sensitive": false,
    "contains": false,
    "required_fields": [],
    "tolerance": 0.0,
    "alternatives": []
  }
}

Question
Starting at 08:30, what time was it 50 minutes earlier? Return HH:MM in 24-hour format.
Question payload
{
  "question_text": "Starting at 08:30, what time was it 50 minutes earlier? Return HH:MM in 24-hour format.",
  "answer_type": "free_text",
  "correct_answer": "07:40",
  "category": "time_arithmetic",
  "difficulty": "medium",
  "tags": [
    "time",
    "arithmetic",
    "subtraction"
  ],
  "schema": {
    "type": "object",
    "properties": {
      "time": {
        "type": "string",
        "description": "Computed clock time in HH:MM 24-hour format"
      }
    },
    "required": [
      "time"
    ]
  },
  "evaluation_criteria": {
    "exact_match": true,
    "case_sensitive": false,
    "contains": false,
    "required_fields": [],
    "tolerance": 0.0,
    "alternatives": []
  }
}

Question
Starting at 04:35, what time is it after 120 minutes? Return HH:MM in 24-hour format.
Question payload
{
  "question_text": "Starting at 04:35, what time is it after 120 minutes? Return HH:MM in 24-hour format.",
  "answer_type": "free_text",
  "correct_answer": "06:35",
  "category": "time_arithmetic",
  "difficulty": "hard",
  "tags": [
    "time",
    "arithmetic",
    "addition"
  ],
  "schema": {
    "type": "object",
    "properties": {
      "time": {
        "type": "string",
        "description": "Computed clock time in HH:MM 24-hour format"
      }
    },
    "required": [
      "time"
    ]
  },
  "evaluation_criteria": {
    "exact_match": true,
    "case_sensitive": false,
    "contains": false,
    "required_fields": [],
    "tolerance": 0.0,
    "alternatives": []
  }
}

Question
Starting at 04:25, what time was it 50 minutes earlier? Return HH:MM in 24-hour format.
Question payload
{
  "question_text": "Starting at 04:25, what time was it 50 minutes earlier? Return HH:MM in 24-hour format.",
  "answer_type": "free_text",
  "correct_answer": "03:35",
  "category": "time_arithmetic",
  "difficulty": "medium",
  "tags": [
    "time",
    "arithmetic",
    "subtraction"
  ],
  "schema": {
    "type": "object",
    "properties": {
      "time": {
        "type": "string",
        "description": "Computed clock time in HH:MM 24-hour format"
      }
    },
    "required": [
      "time"
    ]
  },
  "evaluation_criteria": {
    "exact_match": true,
    "case_sensitive": false,
    "contains": false,
    "required_fields": [],
    "tolerance": 0.0,
    "alternatives": []
  }
}

Question
Starting at 04:45, what time is it after 15 minutes? Return HH:MM in 24-hour format.
Question payload
{
  "question_text": "Starting at 04:45, what time is it after 15 minutes? Return HH:MM in 24-hour format.",
  "answer_type": "free_text",
  "correct_answer": "05:00",
  "category": "time_arithmetic",
  "difficulty": "easy",
  "tags": [
    "time",
    "arithmetic",
    "addition"
  ],
  "schema": {
    "type": "object",
    "properties": {
      "time": {
        "type": "string",
        "description": "Computed clock time in HH:MM 24-hour format"
      }
    },
    "required": [
      "time"
    ]
  },
  "evaluation_criteria": {
    "exact_match": true,
    "case_sensitive": false,
    "contains": false,
    "required_fields": [],
    "tolerance": 0.0,
    "alternatives": []
  }
}