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6 bells commence tolling together and toll of intervals are 2, 4, 6, 8, 10 and 12 s, respectively. In 1 h, how many times, do they toll together?
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- 16
- 32
- 21
- 35
- None of the above
Correct Option: E
LCM of 2, 4, 6, 8, 10, 12
=(2 x 2 x 3 x 2 x 5) = 120
∴ After every 2 min, they toll together.
∴ Number of times they toll together in one hour = (60/2) + 1 times
= 31 times
