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23 August, 23:54

During the school year, Gianna usually keeps a regular sleeping schedule. She goes to bed at 9:15 p. m. and wakes up at 6:30 a. m. For how long does Gianna sleep on a school night? Express the answer in hours and minutes.

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  1. 24 August, 00:14
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    9 hours and 15 minutes
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