It is 45/1440.
It is 45/300, which can be simplified if required.
It is 45/60, which can be simplified, if required.
It is 3/5.
It is 3/4.
Fraction of one hour is 45 minutes is 0.750
45/1 minutes
It is 45/1440.
45 minutes is 45/60 hours.
It is 45/1440.
There are 60 minutes in an hour so 45 minutes is 45/60 = 3/4 of an hour.
It is 45/300, which can be simplified if required.
It is 45/60, which can be simplified, if required.
45 minutes is 3/16 of 4 hours.
1\2
0.75
31/4 hours.