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Railways R.R.C. (Kolkata) Solved Paper Held on 17-11-2013

  • question_answer
    An electronic device makes a beep after every 60 sec. Another device makes a beep after every 62 sec. They beeped together at 10 A.M. The next time, when they would beep together at the earliest is?

    A) 10: 30 AM.                   

    B) 10 : 31 A.M.

    C) 10:59 A.M.                   

    D) 11 A.M.

    Correct Answer: B

    Solution :

    H.C.P. of 60 and 62 = 2\[\times \]2\[\times \]15\[\times \]31 =1860 Hence,  \[\frac{1860}{60}\,\min =31\min \] \[\therefore \] Hence, they would beep together at the earliest is 10:31 A.M.


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