31/4 hours.
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Fraction of one hour is 45 minutes is 0.750
There are 60 minutes in an hour so 45 minutes is 45/60 = 3/4 of an hour.
45 minutes is 3/16 of 4 hours.
Point 75 or 270 degrees.
45 : 2x60 =45 : 120 or as a fraction this would be 9/24