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SSC Quantitative Aptitude LCM & HCF Question Bank LCM and HCF (I)

  • question_answer
    The traffic lights at three different road crossings change after every 48 s, 72 s and 108 s, respectively. If they all change simultaneously at 8:20 h, then at what time will they again change simultaneously?

    A) 8 : 27: 12 h

    B) 8 : 27 : 24 h

    C) 8 : 27 : 36 h

    D) 8 : 27 : 48 h

    Correct Answer: A

    Solution :

    [a] Interval of change = LCM of 48 s, 72 s, 108 s = 432 s = 7 min 12 s Thus, the light will change after every 7 min 12 s. Time of next change = 8 : 27 : 12 h


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