75 minutes.
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15 minutes is 1/4 of an hour
3 hours 15 minutes minus 1 hour 35 minutes = 1 hour and 40 minutes
15 minutes is a whole (1/1) of 15 minutes. It is 1/4 hour or 1/96 day or 1/672 week.
60 minutes = 1 hour so 135 minutes = 2 hours and 15 minutes.60 minutes = 1 hour so 135 minutes = 2 hours and 15 minutes.60 minutes = 1 hour so 135 minutes = 2 hours and 15 minutes.60 minutes = 1 hour so 135 minutes = 2 hours and 15 minutes.
One hour = 60 minutes Quarter hour = 15 minutes 60 + 15 = 75 Minutes