Question

In a school the the duration of primary section is 40 min and senior section is hour if the bell rings at 9 am together when will the next bell ring together

Answer 1

11 a.m.

Explanation:

Duration of Primary Period = 40 min

Duration of Senior Section =1 hour = 60 min

To find out when the next bell will ring together, we first determine the LCM of 40 and 60.

Multiples of 40 are: 40,80,120,160,...

Multiples of 60 are: 60, 120, 180, 240...

From the above, we observe that the bell will ring together exactly 120 Minutes after 9 a.m.

Therefore:

9+120 Min =9 +2 Hours =11 a.m.

Therefore, the bell of the primary section and senior section will ring together at exactly 11 am.