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      Question

      A 420 m long train crosses a platform thrice its length in 2 min. Find the speed of the train.

      TYPE 2
      A 10 m/s Correct Answer Incorrect Answer
      B 15 m/s Correct Answer Incorrect Answer
      C 11 m/s Correct Answer Incorrect Answer
      D 9.5 m/s Correct Answer Incorrect Answer
      E 14 m/s Correct Answer Incorrect Answer

      Solution

      Speed of train = (Length of train + Length of Platform)/Required time Length of train = 420 m Crossing time of platform = 2 ร— 60 = 120 sec Length of platform = 420 ร— 3 = 1260 m Let the speed of train be x. Speed of train = (420 + 1260)/120 โ‡’ ย x = 1680/120 = 14 m/s

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