Question

In a school, the duration of a period in primary section is 40 minutes, middle section is 50 minutes and higher section is 60 minutes. If the bell rings at 7:30 am, when will the three bells ring together again?

Answer 1

Answer:

10 hours later

I.e 5:30 PM

Step-by-step explanation:

Since Primary section is 40 minutes

Middle section is 50 minutes

Higher section is 60 minutes,

We must find the LCM of 40,50and 60

LCM(40,50,60)=600

600 min is 10 hours

Hence the answer

Hope it helps!

Answer 2

Answer:5:30 p.m.

Step-by-step explanation:

Again together=LCM of 40,50,60

=600

=10 hours

They will again ring together at 7:30+10

=17:30

=5:30 p.m.