Question

Three bells ring at intervals of 15,20 and 30 minutes. If they all ring at 9am together, at what time will they next ring together?

a) 11am
b) 12noon
c) 1pm
d)10am​

Answer 1

Answer:

10 A.M.

Step-by-step explanation:

L. C. M. of 15, 20 and 30 minutes = 60 minutes

Hence, the bells will ring together after 60 minutes.

∵ All the bells were ring at 9 a.m.

∴ At 10 am , all the bells will ring together.