Question

Four bells ring at an interval 3min, 4min, 5min and 6 minutes respectively. if all the four bells ring at 9am first, when will it ring again?

Answer 1

We will rake lcm of 3,4,5,6
I.e. 60
So the will rang after 60 min( 1 hour)
I.e. at 10:00 am

Hope it helps