We first need to convert miles into inches:
1 mile = 5280 feet and 1 foot = 12 inches
5280 X 12 = 63360 inches
So, you have a cube measuring 63360 in. X 63360 in. X 1 in.
V = L x W x D
63360 X 63360 X 1 = 4014489600 in³
Divide by 12 to get ft³
4014489600 ÷ 12 = 334,540,800 ft³
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cubic feet are a measure of volume = length x width x height
square miles are a measure of area = length x width and have a height of 0 (zero).
Thus square miles have volume = length x width x 0 = 0.
Thus 0 cu feet = 1 sq mile.
Volume = (5280)2/12 cubic feet = 2,323,200 cubic feet = 17,378,742.9 gallons
That's the VOLUME of a 1-inch slab that covers one square mile. There's not enough
information given to determine how much water is in it.