20 minutes equals 20/60 hours or 1/3 hour.
1/3 of 30 miles in an hour is 10 miles.
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It will take 20 min to go 20 miles at 60 mph.
20 min is one third of an hour so 55/3 miles...
(1 mile/3 min) * (60 min/1 hour) = 20 MPH.
He drove 20 miles in 50 min. so average was 20 x 60/50 = 24 mph
1.7 miles in 20 minutes equates to 5.1 mph