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One hour is equal to 60 minutes so if you take 45 minutes away you are left with 15 minutes.
(10/15) x (60 minutes per hour) = 40 minutes
There are 60 minutes in an hour. In 1 hour and 15 minutes, you have 60 minutes from the hour plus 15 minutes, which totals 75 minutes.
15/60 = 1/4 hour = 15 minutes
There are 30 minutes in half an hour and 15 minutes in a quarter of an hour