cubic feet is a unit of volume and a mile per hour is a unit of speed. The two are not compatible, the question is nonsensical.
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1 cubic mile = (5,280) cubic feet, 1 acre-foot = 43,560 cubic feet, 1 cubic mile = 3,379,200 acre-feet
Cubic feet is a measure of volume, miles per hour is a measure of speed. Since they are completley different concepts there is no way to convert one to the other.
5,280 feet = 1 mile
pi*12*12*1760*3 = 2,388,615.726 cubic feet.
(52 feet) / (5,280 feet/mile x 5 mile/hour) = (52 feet x mile x hour) / (5,280 feet x 5 mile) =(52 hour) / (5,280 x 5) = 0.00197 hour = 7.091 seconds (rounded)