Question

how many minutes are there in three quarters of an hour

Answer 1

45 minutes.

3      x
---   ----
4     60

you multiply 60 and 3.
you get 180, then you divide by 4 and get 45 minutes.

Answer 2

If there are 60 minutes in a hour you just divide 60 by 4 then multiply by 3.

Which comes to 45 minutes