8 hours and 20 minutes
0 hours are in 20 min an hour is 60 min
610 min / 60 = 10.167 hours.
2 hours
5 hours, 50 minutes
60 min = 1 hour so 375 min = 6 hours 15 minutes.
10:05 --> 10 * 60 min + 5 min = 605 min 08:20 --> 8 * 60 min + 20 min = 500 min 605 min - 500 min = 105 min (= 1 3/4 hr)
320 min = 51/3 hours = 5hours 20minutes
5.5 hours.
2 hours
1.95 hours.
3 hours