multiply by 60 minutes/hour
60 x 1.5 = 90 minutes
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15 hours is 900 minutes.
It is: 24 hours minus 8 hours 15 minutes = 15 hours 45 minutes
5 hours subtracted from 7 hours is 2 hours. 5 minutes subtracted from 20 minutes is 15 minutes.Therefore, the answer is 2 hours 15 minutes
7 hours and 15 minutes !
Subtracting 42 minutes from 15 hours 19 minutes gives 14 hours 37 minutes.