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Discussion

  1. A train 200 m long is running at a speed of 36 km/hr. It crosses a bridge in 30 sec. What is the length of the bridge?
    1. 150m
    2. 200m
    3. 125m
    4. 100m
  1. Correct Option: D

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

    Distance covered by train in crossing the bridge = Speed of train in m/sec x time in sec = 10 m/sec x 30 sec = 300 m

    Now, we know that
    Distance covered by train in crossing the bridge= Length of train + Length of bridge

    Therefore, Length of bridge = 300m - 200m = 100m

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