60 minutes = 1 hour so 575 minutes = 575/60 hours = 9.5833... hours
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300 minutes. 60 minutes in an hour times five hours so: 60 minutes x 5 hours = 300 minutes
7 hours and 30 minutes
1 hour 52 minutes
129 minutes is equal to 2 hours and 9 minutes.
Your 1.2 hours is 1 hour and 12 minutes, or 72 minutes. You know an hour is 60 minutes, so 0.1 hours is 6 minutes. You can work that in your head. If 0.1 hours is 6 minutes, then 0.2 hours is twice that, or 12 minutes. The 1 hour, the 60 minutes, plus 12 minutes is 72 minutes. You don't need a calculator for this one.