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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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