Question

in a school three bells ring at 9:00 a.m. after it first Bell will ring after 10 minutes second after 15 minutes and third after 20 minutes this will process continuously repeat at what time this Rebels will ring Unitedly​

Answer 1

It will be at 10 : 00 a.m.

Step-by-step explanation:

All the three bells ring at 9 : 00 a.m.

Now, the first bell rings at an interval of 10 minutes, the second bell rings at an interval of 15 minutes and the third bell rings at an interval of 20 minutes.

Now, 60 is considered to be the least common multiple of 10, 15 and 20.

Hence, after 60 minutes all the three bells will ring together again.

So, it will be at 10 : 00 a.m. (Answer)