Multiple choice general knowledge math & puzzles

Two trains 140 m and 160 m long run at the speed of 60 km/hr and 40 km/hr respectively in opposite directions on parallel tracks. The time (in seconds) which they take to cross each other, is:

  1. 9

  2. 9.6

  3. 10

  4. 10.8
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D Correct answer
Explanation

When trains move in opposite directions, add their speeds: 60 + 40 = 100 km/hr. Convert to m/s by multiplying by 5/18, giving 27.78 m/s. Total distance to cover is sum of both lengths: 140 + 160 = 300 m. Time = distance/speed = 300/27.78 = 10.8 seconds.

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