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1 hour is 60 minutes. 60 minutes + 30 minutes = 90 minutes
45 minutes is closer to 1 hour - as the minutes have already left 30 minutes and are advancing towards 1 hour or 60 min
30 minutes is 1/2 of an hour (50%) or 0.5 hours.
1 hour = 60 minutes 1/2 hour = 30 minutes = 0.5 of an hour 5.5 hours = 5 hours 30 minutes
There are thirty minutes in one half hour.