Three bells started tolling together. Each of them then tolls after 0.25 sec, 0.1 sec and 0.125 sec. After how many seconds will they again toll together?

First bell tolls every 0.25 seconds.

Second bell tolls every 0.1 seconds.

Third bell tolls every 0.125 seconds.

We need to find the Least common Multiple (LCM) of these time intervals to determine when the three bells will toll together again.

LCM of 0.25 sec, 0.1 sec and 0.125 sec = 0.5 sec ​​