There can be no equivalence.
"How long" refers to a measure of distance, or of time. 57.1 miles an hour is a measure of speed. The two measure different things and, according to basic principles of dimensional analysis, any attempt at conversion from one to the other is fundamentally flawed.
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657.0950374 miles per hour
one hour.
3 hours to travel 15 miles at 5 miles per hour
1 hour. You can go 80 miles in an hour. Hence Miles Per Hour or MPH.... If you were traveling at 45 Miles Per Hour, that means In 1 Hour you cover 45 Miles
Depends on the average miles per hour. At 47 miles per hour, it will take 10 hours.