Question

There are four bells which toll at intervals of 3, 7, 12 and 14 sec respectively. If they tolled
together at 12 noon, when will they again toll together?

Answer 1

Answer:

The intervals of ringing of these 3 bells are 4,7 and 14 minutes. so, Minimum time after which these all 3 bells will ring = LCM(4,7,14) = 28 min. so, After 28 minutes , these all 3 bells will ring together. And, so, these bells will ring together at 6:28 am.