45 minutes.
It is: 24 hours minus 8 hours 15 minutes = 15 hours 45 minutes
35 minutes.
3 hours 15 minutes minus 1 hour 35 minutes = 1 hour and 40 minutes
6 hours 15 minutes.
7 hours and 15 minutes.
45 minutes.
It is: 24 hours minus 8 hours 15 minutes = 15 hours 45 minutes
23 hours 15 minutes minus 45 minutes is 22 hours 30 minutes.
35 minutes.
It is: 195 minus 24 = 171 minutes or 2 hours and 51 minutes
3 hours 45 minutes.
3 hours 15 minutes minus 1 hour 35 minutes = 1 hour and 40 minutes
6 hours 15 minutes.
It is: 6 hours and 15 minutes
Subtracting 42 minutes from 15 hours 19 minutes gives 14 hours 37 minutes.
2.25 hours