This is an average speed of 4.3 miles per hour.
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4.286 mph (rounded)
His velocity was zero - since he's back to where he started. (Try to substitute speed where appropriate.)
Speed = distance/time. Convert 14 minutes to hours first: (14 min)/(60 min/hr) = 0.2333... hours. (2 mile)/(0.2333 hr) = 8.571 miles per hour.
It is: 14/60 or 7/30 of a minute
1 mile is 5280 feet or 5280 x 12 = 63360 inches 14 miles is therefore 14 x 63360 = 887040 inches 3 inches takes 1 minute, hence 887040 inches will take 887040/3 = 295680 minutes