First, you can convert the 8 hours to 7 hours and 60 minutes. Then it's easy to subtract minutes from minutes.
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It is: 24 hours minus 8 hours 15 minutes = 15 hours 45 minutes
8 hours minus 2 hours and 20 minutes is equal to 5 hours and 40 minutes.
You need two more hours to make a complete day. Add 2 to 8 am and you get 10am.
17 days and 17 hours minus 8 days and 7 hours equals 9 days and 10 hours.
Subtracting 55 minutes from 9 hours gives 8 hours, 5 minutes.