If it takes 4 minutes to run 1 mile then in 15 times as long (1 hour) you would run 15 miles. So the average speed must be 15 miles per hour.
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Divide Distance by Time to calculate Speed. 15 / 70 = .2142857 miles per minute or an average of 1/5 to 1/4 mile per minute.
375 meters/per minute
You need to run at an average speed of 15 mph.
About 365.5 meters a minute.
His speed is (3/8 ft)/(3/4 minute) = 1/2 feet per minute.