Question

in a school the duration of a period in junior section is 40 minutes and senior section is 1 hour if tge first bell for each rings at 9am when will the two bells ring together again​

Answer 1

time for junior section is 40 min

time for senior section is 1 hour ie 60 min.

take LCM of 40 and 60

it will come out to be 120 .

the bells will ring together after 120 minutes.

ie 2 hours which is 11am

Answer 2

11am because for junior section45+45+45 =1owo