Five bells begin to toll together and toll respectively at intervals of 6, 5, 7, 10 and 12 seconds. How many times will they toll together in one hour excluding the one at the start ? A. 7 times B. 8 times C. 9 times D. 11 times

To toll together we need to take the LCM of each seconds of bell.

L.C.M. of 6, 5, 7, 10 and 12 = 420.

420/60 = 7 minutes

So, the bells will toll together after every 7 minutes.

Therefore, in 1-hour (or 60 minutes), the bells will toll together 8 times (7 x 8 = 56), excluding the one at the start.

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