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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?

Correct Answer:

Explanation:

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


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