Multiple choice

Train A leaves Ludhiana for Delhi at 11 am running at a speed of 60 km/hr. Train B leaves Ludhiana for Delhi by the same route at 2 pm on the same day, running at a speed of 72 km/hr. At what time will the two trains meet each other ?

  1. 5 am on the next day

  2. 2 am on the next day

  3. 5 pm on the next day

  4. 2 pm on the next day
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A Correct answer
Explanation

Train A travels for 3 hours before Train B starts, covering 60 * 3 = 180 km. Relative speed = 72 - 60 = 12 km/hr. Time to catch up = 180 / 12 = 15 hours. 15 hours after 2 pm is 5 am the next day.

AI explanation

By 2 pm, train A has travelled for 3 hours at 60 km/hr, giving it a lead of 180 km. The relative speed of train B to train A is 72 minus 60, which equals 12 km/hr, so the time taken to catch up is 180 divided by 12, yielding 15 hours. Adding 15 hours to 2 pm gives 5 am on the next day.

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