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    Question

    Four runners started running simultaneously from a

    point on a circular track. They took 400 seconds, 600 seconds, 720 seconds and 900 seconds to complete one round. After how much time do they meet at the starting point for the first time ? 
    A 1800 seconds Correct Answer Incorrect Answer
    B 3600 seconds Correct Answer Incorrect Answer
    C 2400 seconds Correct Answer Incorrect Answer
    D 4800 seconds Correct Answer Incorrect Answer

    Solution

    Required time LCM of 400, 600, 720 and 900 seconds = 3600 seconds

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