Question

In a school,the duration of period in junior section is 40 minutes and senior section is 1 hour. If the first bell for each section rings at 9:00 am, when will the two bells ring together again

Answer 1

Answer:

Step-by-step We know that In a school the duration of a period in junior section is 40 minutes and in senior section is 1 hour .

To solve the problem we have to find the least common multiple of 40 mins and 1 hr (60 min) 

The least common multiple of 40 , 60 is 120

2³⋅3^1⋅5^1=120

So bell will ring together at 120 minutes after 9:00am ie 11:00am

Answer 2

Answer:

11 Am

Step-by-step explanation:

junior 9 am 9.40 am and 10.20 and then 11am

seniors 9 am 10 am and 11 am

so at 11 both bells will ring together