How many times do they toll?

Three bells toll together at intervals of 4,6 and 8 seconds. In two minutes how many times do they toll together???

Answer:
5 times.
Explanation:
The LCM of 4,6 and 8 is 24
Given 2 minutes i.e 120 seconds
No. of times = 120(time in sec)/24(LCM) = 5 times