Question
Mon May 14, 2012 By: Mridulla Dharshini

4 bells toll together at 9:00 am. they toll after 7,8,11 and 12 seconds respectively. How many times will they toll together again in next 3 hours.

Expert Reply
Tue May 15, 2012
Taking lcm (7,8,11,12) = 1848

After every 1848 secs they will toll together.
 
In 3 hours there are 10800 secs ..
 
so they will toll together 5 times in the next 3 hours.
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