The wheels revolve round a common horizontal axis. They make 15, 20 and 48 revolutions in a minute respectively. Starting with a certain point on the circumference down wards. After what interval of time will they come together in the same position?

    A. 1 min
    B. 2 min
    C. 3 min
    D. None

    Explanation:

    Time for one revolution = 60/15 = 4

    60/ 20 = 3

    60/48 = 5/4

    LCM of 4, 3, 5/4

    LCM of Numerators/HCF of Denominators =

    60/1 = 60

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