An inverted square pyramid 20 ft high with a square base having 8-foot sides is filled with oil at the rate of 2 cubic ft/s. How fast is the oil rising when it is at 4 ft deep? Volume of square pyramid: , where A = area of the base, h = height.
A.
0.313 ft/s
B.
0.625 ft/s
C.
0.78 ft/s
D.
1.25 ft/s

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