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      Question

      A, B and C start running around a circular track and

      complete one round in 10, 15 and 25 seconds respectively. In how many seconds will the three meet again at the starting point if they all have started running at the same time?
      A 150 seconds Correct Answer Incorrect Answer
      B 100 seconds Correct Answer Incorrect Answer
      C 120 seconds Correct Answer Incorrect Answer
      D 130 seconds Correct Answer Incorrect Answer

      Solution

      As A, B and C complete one round in 10, 15 and 25 seconds respectively, they will be able to meet at the starting point only if we get a common multiple of 10, 15 and 25. To meet for the second time, we need to calculate LCM. LCM (10,15,25) = 150 ∴ They will meet again in 150 seconds.

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