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SSC Sample Paper Mock Test-16 SSC CGL Tear-II Paper-1

  • question_answer
    The traffic lights at three different road crossings change after 24 s, 36 s and 54 s respectively. If they all change simultaneously at 10 : 15 : 00 am, then at what  time  will  they  again  change simultaneously?

    A) 10 : 16 : 54 am

    B)  10 : 18 : 36 am

    C)  10 : 17 : 02 am

    D)  10 : 22 : 12 am

    Correct Answer: B

    Solution :

    Again, change the colour = LCM of 24, 36 and 54 = 216 s = 3 min 36 s \[\therefore \] They all change the colour together = 10 : 15 : 00 + 0 : 3 : 36 = 10 : 18 : 36


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