You have to know that 1 day = 24 hours and 1 hour = 60 minutes.
The tricky part is converting hours:minutes into decimal hours.
15 minutes = 15/60 = 1/4 = 0.25 hours
Therefore 7 hrs 15 min = 7.25 hours
What fraction of a day?
7.25 / 24 = .30208333... = 30.2 percent
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It is 15/120, which can be simplified, if required.
15(days)*24(hours/day)*60(min/hour)=21600min
75 Since one hour has 60 min, all you have to do is add 15 min and that equals 75 min.
15 minutes is a whole (1/1) of 15 minutes. It is 1/4 hour or 1/96 day or 1/672 week.
15 minutes is one quarter of an hour.