Question

In a school the duration of a class in the primary
section is 40 minutes and in the secondary section
is 1 hour. If both section of school begins at 10 am,
When will the two bells
ring together again​

Answer 1

Answer:

Conver 1 hour to minute which is 60

then We need to find LCM of 40 and 60

Step-by-step explanation:

to find lcm

List the multiples of each number until at least one of the multiples appears on all lists

Find the smallest number that is on all of the lists

This number is the LCM

divide both 40 and 60 with 5

which will be 8 and 12

then divide with another prime 2

which will be 4 and 6

again divide with 2

which will be 2 and 3

as we are left with prime number we need to multiply remaining no and no by qhich we have divided. which will be 5*2*2*2*3=120min which will be 2 hours

2 hours after 10am is 12am