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10th Class Mathematics Real Numbers Question Bank Real Numbers

  • question_answer
    Three bulbs are connected in such a manner that they glow for every 24 seconds, 36 seconds and 54 seconds respectively. All of them glow at once at 8 a.m. When will they again glow simultaneously?

    A)  8:30:36 a.m.

    B)         8:03:36 a.m.

    C)  8:36:03 a.m.

    D)         8:36:30 a.m.

    Correct Answer: B

    Solution :

     All the three bulbs glow at once at 8 a.m. The  time when  they glow simultaneously again = L.C.M. (24, 36, 54) seconds =216 seconds = 3 minutes 36 seconds \[=\sqrt{64+36}=10\,cm\]The time when the three bulbs glow together again is at 8 : 03 : 36 a.m.


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