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    • Question

      Three bells ring at intervals of 28 seconds, 60 seconds,

      and 84 seconds, respectively. How many times will all three bells ring together in a span of 10 minutes?
      A 1 Correct Answer Incorrect Answer
      B 5 Correct Answer Incorrect Answer
      C 2 Correct Answer Incorrect Answer

      Solution

      Time taken by all 3 bells to ring together = L.C.M of 28, 60 and 84 = 420 seconds 10 minutes = 10 X 60 = 600 seconds 600 ÷ 420 ~ 1.42 So, the three bells will ring together only once in the given interval of 10 minutes.

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