Question

Four bells begin to toll together at intervals of
6, 7, 8 and 9 seconds. What is the number of
times that they will toll together in 2 hours?
(a) 14
(b) 15
(c) 13
(d) 11​

Answer 1

Answer:

So the answer of your que was a. 14

Step-by-step explanation:

First take LCM of 6,7,8 and 9 = 504 .

so after every 504 seconds 4 bells will toll together .

Now, seconds in 2hr = 7200

so number of times that 4 bells toll together in 2 hrs = 7200/504 = 1428

i.e. 14 times.

Hence, option (a) is correct