7 hours, 35 minutes
7.58 hours
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9:45 pm to midnight is 2 hours and 15 minutes Midnight to 8:30 am is 8 hours and 30 minutes Hence the total is 10 hours and 45 minutes = 10 and 3/4 or 10.75 hours
2 hours and 40 minutes
165
945 pm to midnight is 2 hours, 15 minutes. Midnight to 830 am is 8 hours, 30 minutes. The total is 10 hours, 45 minutes.
1 hour is the equivalent of 60 minutes, so 2 hours is 120 minutes. Add 45 minutes to the 120 minutes (or 2 hours) and voila, the sum or the answer is 165 minutes.