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UPSC PYQPrelims 2025

Civil Services Examination · प्रश्न 37

P and Q walk along a circular track. They start at 5:00 a.m. from the same point in opposite directions. P walks at an average speed of 5 rounds per hour and Q walks at an average speed of 3 rounds per hour. How many times will they cross each other between 5:20 a.m. and 7:00 a.m.?

  1. 12
  2. 13
  3. 14
  4. 15
उत्तर देखें और व्याख्या

उत्तर: (B) 13

व्याख्या

Relative speed 8 rounds/hour, so they meet every 7.5 minutes (5:07:30, 5:15, 5:22:30, ...). Between 5:20 and 7:00 (excluding the meeting exactly at 7:00) there are 13 crossings. (Answer as per the official UPSC answer key.)