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      Question

      Arun, Varun, and Tarun run around a circular field and

      complete one full circle in 7 seconds, 14 seconds, and 21 seconds respectively. If they all begin from the same point at once, after how much time will they meet again at the starting place?
      A 60 secs Correct Answer Incorrect Answer
      B 70 secs Correct Answer Incorrect Answer
      C 42 secs Correct Answer Incorrect Answer
      D 36 secs Correct Answer Incorrect Answer

      Solution

      ATQ,

      Required time taken = LCM of 7, 14 and 21 = 42 seconds

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