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    Question

    A man is running at 6 m/sec in the same direction of a

    train. The train crosses him in 5 seconds. If speed of the train is 108 km/hr, find the time to cross a bridge of 90 metres.
    A 5 seconds Correct Answer Incorrect Answer
    B 6 seconds Correct Answer Incorrect Answer
    C 7 seconds Correct Answer Incorrect Answer
    D 8 seconds Correct Answer Incorrect Answer

    Solution

    Train speed = 108 × (5/18) = 30 m/sec
    Relative speed = 30 - 6 = 24 m/sec
    L / 24 = 5 ⇒ L = 120 metres
    Time to cross bridge = (120 + 90)/30 = 210/30 = 7 seconds

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