14 400
There are 4 quarters in one hour. x
4
Three quarters of an hour is forty-five minutes.
There are 105 minutes in one and three quarters of an hour, 60 + 45.
45
45
Four of them of 15 minutes
An hour is 60 minutes, there are 4 quarters in an hour. Therefore three quarters of a hour is 45 minutes.
A fourth of an hour is 60/4=15 minutes, so three quarters of an hour would be 15x3= 45 minutes.
There are 45 minutes in three quarters of an hour.
225
45 minutes