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    Question

    850 metres long train crosses a man who is moving in the

    same direction with a certain speed, in 50 seconds. If the same train can cross a tree in 20 seconds with the same speed, then find the speed of the man.
    A 22.5 m/sec Correct Answer Incorrect Answer
    B 29.5 m/sec Correct Answer Incorrect Answer
    C 25.5 m/sec Correct Answer Incorrect Answer
    D 21.5 m/sec Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    Speed of train = 850/20 = 42.5 m/sec Let the speed of the man be ‘s’ m/sec Relative speed of the train = (42.5 – s) m/sec According to the question, (42.5 – s) = 850/50 Or, s = 42.5 – 17 = 25.5 Therefore, speed of the man = 25.5 m/sec

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