Question

Four bells begin to toll together and toll respectively at intervals of 5, 6, 8 and 12 seconds. How many times will
they toll together in an hour excluding the one at the start
​

Answer 1

Answer:

L.C.M. of 6, 5, 7, 10 and 12 is 420. So, the bells will toll together after every 420 seconds i.e. 7 minutes. Now, 7 x 8 = 56 and 7 x 9 = 63. Thus, in 1-hour (or 60 minutes), the bells will toll together 8 times, excluding the one at the start.

Step-by-step explanation:

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