How many times they will toll together ?

Six bells commence tolling together and toll at the intervals of 2, 4, 6, 8, 10, 12 seconds resp. In 60 minutes how many times they will toll together?

  1. 31
  2. 21
  3. 15
  4. 40
Anurag Mishra Professor Asked on 23rd September 2015 in Maths.
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  • 1 Answer(s)

    Answer: (1) 31

    Explanation:-
    The L C M of 2, 4, 6, 8, 10, 12 = 2 x 2 x 2 x 3 x 5
    = 120
    Then, 120 sec = 120/60 = 2 min
    Six bells tolling together after 2 min
    Then, the number of tolling together = 60/2 + 1 = 30 + 1
    = 31

    Hence, the answer is (1) 31.

    Anurag Mishra Professor Answered on 23rd September 2015.
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