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    Question

    Three boys runs around a circular track and takes 20

    min, 25 min and 30 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

    Solution

    ∴  Required time = LCM of (20, 25 and 30) = 300 min Hence, after 300 min they all come relatively to the same position as at a certain point of time in their path.

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