Answer: 5 times
From given, we have,
9:00 AM + LCM ( 7, 8, 11 & 12 )
⇒ 9:00 AM + 1848/60 Min
= 9:00 AM + 30.80 min
- In 3 hours there are = secs.
- Number of times the bell would toll
- Number of times the bell would toll
After every 1848 secs, they will toll together.
So, The sequence will be 9:00 AM , 9:31 AM , 10 : 02 AM , 10:33 AM, 11:04 AM , 11: 35 AM…
Thus, in the 3 hours, the bells will toll together 5 times.