A mile is a unit of distance. An hour is a unit of time. Without some unit of speed to convert, the two units are incompatible.
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The average person could run 9 to 12 miles in three hours. Most people could not run for three hours, so many would walk portions of this challenge.
5 mph or miles per hour. So in three hours she can run 3*5 = 15 miles.
Miles do not convert to hours. Miles are length and hours is time.
45 miles in three hours at 15 miles per hour.
the answer is 10.62 hours in 743 miles