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Discussion

  1. A passenger train running at a speed of 72 km/hr crosses a 400m long platform in 30 sec. What is the length of the train?
    1. 200 m
    2. 150 m
    3. 180 m
    4. 240 m
  1. Correct Option: A

    Speed of train in m/sec = 72 km/hr x 5/18 = 20 m/sec

    Distance covered in meter = Time taken in crossing the platform in sec x speed in meter = 30 sec x 20 m/sec = 600m

    Now, we know , Distance covered by train in crossing the platform = Length of train + Length of Platform
    Therefore, length of the train = 600m - 400m = 200m


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