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
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Relative speed = 60 + 40 = 100 km/hr = 100 * (5/18) m/s = 250/9 m/s. Total distance to cover = 140 + 160 = 300 m. Time = Distance / Speed = 300 / (250/9) = (300 * 9) / 250 = 2700 / 250 = 10.8 seconds.

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