Four bells toll after an interval of 8,9,12, and 15 second respectively

Four bells toll after an interval of 8,9,12, and 15 seconds respectively. When will they toll again together?

Four bells toll after an interval of 8,9,12, and 15 second respectively. When will they toll again together?
We need to find the LCM of 8 9 12 and 15
8 = 2x2x2
9 = 3x3
12 = 2x2x3
15 = 3x5
LCM = 2x2x2x3x3x5 = 360 seconds
All 4 bells will toll together after every 360 seconds