6 hours and 31 minutes
90
3 hours and 6 minutes
2:45 + 3:57 = 6 hours 42 minutes
8 hours and 20 mins
Three hours is 180 minutes. 90 minutes is a half of this.
8hours 15 minutes
((1 hour 32 minutes) + (2 hours)) + (3 hours 56 minutes) = 7 hours 28 minutes
90 minutes is 3/2 hours.
6 hours and 31 minutes
5 hours and 55 minutes.
(2 hours 45 minutes) + (3 hours 58 minutes) = 6 hours 43 minutes.
90 min/8 hours = 90 min/480 min = 3/16
1/2
90
2 hours and 51 min.
3 hours and 6 minutes