Fifteen.
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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
There are 60 minutes in an hour There are 4 quarter minutes in a minute So there are 4 * 60 quarter minutes in an hour which is 240.
One hour = 60 minutes Quarter hour = 15 minutes 60 + 15 = 75 Minutes
One and one-quarter hours is equal to 75 minutes.