Multiple choice

A 180 metres long train takes 90 seconds to cross a platform thrice its length. In what time will it take to cross a bridge whose length is 3/4th of the length of platform ?

  1. 73.125 sec

  2. 83 sec

  3. 76.25 sec

  4. 40 sec

  5. None of these
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A Correct answer
Explanation

Train length = 180 m. Platform length = 3 × 180 = 540 m. Total distance to cross platform = 180 + 540 = 720 m. Time = 90 seconds. Speed = 720/90 = 8 m/s. Bridge length = (3/4) × 540 = 405 m. Distance to cross bridge = 180 + 405 = 585 m. Time = 585/8 = 73.125 seconds.

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