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    Question

    Three boys runs around a circular track and takes 15

    min, 20 min and 35 min respectively to complete the one round. When do they all come relatively to the same position as at a certain point of time in their path?
    A 600 min Correct Answer Incorrect Answer
    B 252 min Correct Answer Incorrect Answer
    C 420 min Correct Answer Incorrect Answer
    D 300 min Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    ∴  Required time = LCM of (15, 20 and 35) = 420 min Hence, after 420 min they all come relatively to the same position as at a certain point of time in their path.

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