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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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