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    Question

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

    same direction with a certain speed, in 30 seconds. If the same train can cross a tree in 20 seconds with the same speed, then find the speed of the man.
    A 12 m/sec Correct Answer Incorrect Answer
    B 15 m/sec Correct Answer Incorrect Answer
    C 13 m/sec Correct Answer Incorrect Answer
    D 17 m/sec Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    Speed of train = 900/20 = 45 m/sec Let the speed of the man be тАШsтАЩ m/sec Relative speed of the train = (45 тАУ s) m/sec According to the question, (45 тАУ s) = 900/30 Or, s = 45 тАУ 30 = 15 Therefore, speed of the man = 15 m/sec

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