9 hours.
8 hours, 55 minutes
It is 3:45.
48900 minutes
It is 6.5 + 12k hours where k is an integer.
It is 4 hours and 30 minutes.
It is 4 hours and 15 minutes.
6 hours and 45 minutes.
6 hours and 40 minutes, or 6 and 2/3 hours.
7 hours and 30 minutes
From 9:15 AM to 5:15 PM is a total of 8 hours. To break it down, from 9:15 AM to 5:00 PM is 7 hours and then adding the additional 15 minutes brings the total to 8 hours.
7:30 = 15:45 - 8:15
9 hours, 15 minutes 9.25 hours 9 and 1/4 hours