15 MPH
1 mile / 4 minutes x 15 /15 = 15 miles / 60 minutes ... or ... 15 miles / 1 hour.
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1 mile in 3 minutes is3 min * 20 is 1 hour1 mile * 20 = 20 mph
It is 7.5 mph.
1 mile in 6 minutes = 10 miles in 60 minutes (or an hour) So the answer is 10 mph.
Two minutes per mile at 30 mph.
Time = Distance/Speed = 1 mile/5.4 mph = 0.185185... hours = 11.11 minutes.