Multiple choice general knowledge math & puzzles

How long will a train 100m long traveling at 72kmph take to overtake another train 200m long traveling at 54kmph

  1. 55 sec

  2. 1 min 15 sec

  3. 1 min

  4. 70sec
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Relative speed = 72 - 54 = 18 kmph = 5 m/s. Total distance to cover = 100 + 200 = 300m. Time = distance/speed = 300/5 = 60 seconds = 1 minute. The faster train must cover the sum of both train lengths to completely overtake.

AI explanation

To overtake, the faster train must cover the combined length of both trains relative to the slower one. Relative speed = 72 − 54 = 18 km/h = 5 m/s. Combined length = 100 + 200 = 300 m. Time = distance/speed = 300/5 = 60 seconds = 1 minute.

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