(20.75 - 9.5) hrs = 11.25 hrs = 11 hrs and 15 min
11.25 hours
7 hours
8 hours.
1.5 hours.
7 hours and 30 minutes.
2hrs and 30mins
9 + 24k where k is an integer.
4 hours and 15 minutes.
7 and a half
71/2 hours IF they're both in the same day.
935
18.5 hours