This question cannot be answered sensibly. A mile per hour is a measure of speed, with dimensions [LT-1]. A minute is a measure of time, with dimensions [T]. Basic dimensional analysis teaches that you cannot convert between measures with different dimensions such as these without additional information.
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20 minutes equals 20/60 hours or 1/3 hour. 1/3 of 30 miles in an hour is 10 miles.
96 minutes
15 minutes = 1/4 of an hour
60 minutes
(1 mile/3 min) * (60 min/1 hour) = 20 MPH.