Answer:
9h 30min
Explanation:
8.45pm to 9pm = 15 minutes
9pm to 6am = 9h
6am to 6.15am = 15 minutes
Total amount of time spent to sleep = 15 min + 9h + 15 min
= 9h 30min
9 hours and 30 minutes
Step-by-step explanation: You can just count by hand. 8:45-9:45 (1 hour) 9:45-10:45 (2 hours) so on and so on.
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