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Railways Sample Paper RRBs Assistant Loco Pilot and Technician CBT STAGE-I Sample Paper-13

  • question_answer
    4 bells ring at intervals of 30 min,\[1\,\,h,1\frac{1}{2}\,\,h\]and 1 h 45 min, respectively. All the bell ring simultaneously at 12 noon. They will again ring simultaneously at

    A)  12 mid night     

    B)  3 am

    C)  6 am               

    D)  9 am

    Correct Answer: D

    Solution :

    LCM of 30, 60, 90, 105 = 1260 Hence, all the bells will again ring simultaneously after 1260 min, i.e. at 9 am.


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