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      Question

      Three bells ring at interval of 36 seconds, 40 seconds

      and 48 seconds respectively. They start ringing together at a particular time. They will ring together after every
      A 6 minutes Correct Answer Incorrect Answer
      B 12 minutes Correct Answer Incorrect Answer
      C 18 minutes Correct Answer Incorrect Answer
      D 24 minutes Correct Answer Incorrect Answer

      Solution

      Given that Three bells ring at interval of 36 seconds, 40 seconds and 48 seconds respectively. To find particular time after which they will ring together, we need to find L.C.M of 36,40 & 48. L.C.M of 36,40 & 48 is 720. Therefore three bells will ring together after every 720seconds i.e.., 12minutes.

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