Question

Four bells begin to toll together and then each one at intervals of 6 s, 7 s, 8 s and 9 s respectively. the number of times they will toll together in the next 2 hr is:op 1:

Answer 1

Hi ,

It is given that ,

Four bells begin to toll together

and each one at intervals of 6s ,7s,

8s and 9s

We have to find LCM of 6 , 7 , 8 , 9

LCM = 504 s

We know that ,

1 hour = 3600 sec

2 hours = 7200 sec

Now ,

Number times they toll together

in 2 hours = 7200/504

≈ 14.28

We take integral part of it.

Therefore ,

14 times the 4 bells toll together in

2 hours.

I hope this helps you.

: )