Answer-Five bells commence tolling together and toll at intervals of 2, 4, 9, 12 and 15 seconds respectivel...

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LCM of the time intervals will be 2,4,9,12, and 15 will be 180. 1 min  60 seconds. 180 seconds  18060  3 minutes. Therefore number of times they all toll together  453   1  16 times.

Five bells commence tolling together and toll at intervals of 2, 4, 9, 12 and 15 seconds respectively. In 45 minutes, how many times do they toll together?

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