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Discussion :: Problems on H.C.F and L.C.M

  1. Three bells toll at intervals of 36 sec, 40 sec, and 48 sec respectively. They start singing together at a particular time. When will they toll next together?

    2. A.
    6 minutes
    B.
    12 minutes
    C.
    18 minutes
    D.
    24 minutes

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    Answer : Option B

    Explanation :

    Firstly find the LCM of 36, 40, and 48

    Aptitude H.C.F and L.C.M

    LCM = 2 x 2 x 2 x 2 x 3 x 3 x 5 = 720 seconds

    Hence, after 720 seconds or 12 minutes three bells will toll together.

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