Question

Three bells A, B and C ring at interval of 3 hours, 4 hours and 5 hours respectively. After how many hours will the three bells first ring simultaneously (at the same time)?

Answer 1

Answer:

Multiply each number i.e 3,4,5 by 1,2,3,...so on

then did the common multiples i.e 60,120 ...

Answer 2

Answer:

LCM of 3,4,5= 60

Step-by-step explanation:

The time all the bells will ring will be the LCM of there intervals of ringing.