An hour is 60 minutes and if a quarter has passed after the hour then that means 15 minutes have passed past the hour.
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There are 15 minutes in a quarter of an hour
There are 15 minutes in a quarter hour.
An hour is sixty minutes. A quarter hour is fifteen minutes.
There are 15 minutes in a quarter hour.
There are 30 minutes in half an hour and 15 minutes in a quarter of an hour