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15 hours.
1075
10 hours and 15 minutes.
2 hours and 30 minutes.
It is (8.5 + 24k) hours where k is an integer.
That's nine and one quarter hours.
8 hours 30 minutes.
6 and 1/2 hours
6 hours 50 minutes
It is 8 hours and 38 minutes.
It 21 hours
9.5