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    Question

    Five bells commence tolling together and tolls at

    intervals of 6, 12, 36, 42 and 60 seconds respectively. In 126 minutes, how many times do they toll together? 
    A 9times Correct Answer Incorrect Answer
    B 6times Correct Answer Incorrect Answer
    C 7times Correct Answer Incorrect Answer
    D 8times Correct Answer Incorrect Answer

    Solution

    First time, 5 bells will toll together on = LCM (6,12,36,42 & 60sec) = 1260 sec = 21 minIn 126 minutes , they will toll together = 126/21 = 6 times But it is also given that they commence tolling together at starting time so answer is 6 + 1 = 7.

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