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6 hours and 30 minutes.
36
It is 9 hours.
(8.25 + 24k) hours, where k is any integer.
2.25 assuming both am or pm
2 hours and 45 minutes.
5 hrs, 15 mins
15 hours and 20 minutes.
There are 9 and 1/2 hours between 8:45 am and 6:15 pm.
6 hours and 45 minutes.
840
7:45pm