Question

Five bells beginning together toll at interval of 4s, 5s, 7s, 8s and 10 s, respectively. After what interval of time will they toll again together?​

Answer 1

Step-by-step explanation:

They will be ring together at a time which is a multiple of

4, 5, 7, 8, 10.

A number which is multiple of 4, 5, 7, 8, 10 is the multiple of their L.C.M. So they will be in phase after 280 seconds.