Question

4 bell toll at 7,8,11,12 seconds at 9.00am how many time they toll together

Answer 1

All 4 bells toll together at LCM(7, 8, 11, 12) = 1848 secs

3 hours = 3600 * 3 = 10800 secs

Number of times = 10800/1848 --> 5 times