(1 mile/3 min) * (60 min/1 hour) = 20 MPH.
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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
(19.76 miles)/[(42.23 minutes)/(60 minutes/hour) = 28.08 miles/hour, to the justified number of significant digits.