It is 15/60, which can be simplified, but probably best to see if you need to add or subtract other fractions of an hour before simplifying.
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15 minutes is one quarter of an hour.
-- One hour = 60 minutes. -- A fraction of an hour is the same fraction of 60 minutes. -- To convert a fraction of an hour to minutes, multiply the fraction by 60 minutes.
15/60
15 minutes is a whole (1/1) of 15 minutes. It is 1/4 hour or 1/96 day or 1/672 week.
There are 60 minutes in 1 hour→ as a fraction of an hour 15 minutes is 15/60 hour = 1/4 hourone quarter15/60 = 3/12 = 1/4