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Discussion

  1. The length of train is equal to the length of the platform. Suppose the train is running at a speed of 72 km/hr and it crosses a platform in 2 minutes. What is then the length of the train?
    1. 620 m
    2. 500 m
    3. 550 m
    4. 600 m
  1. Correct Option: D

    Speed in m/sec = 36km/hr x (5/18) = 10 m/sec

    Given, Time taken by train to cross the platform = 2 min = 120 sec

    Therefore, the distance covered by train in crossing the platform = 10 m/sec x 120 sec = 1200 m

    Now, distance covered by train in crossing the platform = Length of train + Length of Platform

    Given, Length of train = Length of Platform = x

    Therefore, 2x = 1200
    so, x = Length of train = 1200/2 = 600 m

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