The answer is 54 minutes.
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90 percent out of 100 percent = 9/10 or 0.990%/100% = 9/10 or 0.9
10 hours = 1,000 percent of an hour.
9/ 10 == 0.9 decimal or 9/10 x 100 = 90 percent
It is 21 hours.Note: 10 am to 10 pm is 12 hours, 10 pm to 7 am is 9 hours, 12 + 9 = 21
9 hours.