Question

3 bells toll at intervals of 12 minutes, 15 minutes,18 minutes respectively. if they start tolling together after what time they next toll together?

Answer 1

$lcm \: of \: 12 \: \: \: \: \: 15 \: \: \: \: \: 18 \\ = 180 \: \\ after \: 180 \: minuts \: or \: 3 \: hours \: they \: toll \: togther \:$

Answer 2

No. Of bells=3

their interval of time 12,15and 18minutes

time when they toll together= 12+15+18
=45÷3
15 minutes