Question

Five bells begin to toll together and toll respectively at intervals of 6. 7. 8 and 12
seconds. After how much time will they toll together again?​

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.

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Answer 2

Answer:

required time =(lcm of 6,7,8,12) 2×2××3×7×2=168 seconds which is 2 minutes 48 seconds