It is: 4.5 hours
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3 hours 30 minutes = 3.5 hours
2.5
It is 1.5 hours
First you divide by 60 to find the hours. In this case, you do 1800/60 and get 30. There is no decimal part or remainder and so there will be no minutes. Therefore, in 1,800 minutes, there is exactly 30 hours.
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