R

Ruchi Sharma • 9.87K Points
Tutor III Math

Q. Six bells commence tolling together and toll at intervals of 2, 4, 6, 8 10 and 12 seconds respectively. In 30 minutes, how many times do they toll together ?

  • (A) 4
  • (B) 10
  • (C) 15
  • (D) 16
  • Correct Answer - Option(D)
  • Views: 1012
  • Filed under category Math
Explanation by: Mr. Dubey
L.C.M. of 2, 4, 6, 8, 10, 12 is 120.
So, the bells will toll together after every 120 seconds(2 minutes).
In 30 minutes, they will toll together
(30/2)+ 1 = 16 times

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