A distillate flows into an empty 64-gallon drum at spout A and ou

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A distillate flows into an empty 64-gallon drum at spout A and out of the drum at spout B. If the rate of flow through A is 2 gallons per hour, how many gallons per hour must flow out at spout B so that the drum is full in exactly 96 hours?

A、$$\frac{3}{8}$$
B、$$\frac{1}{2}$$
C、$$\frac{2}{3}$$
D、$$\frac{4}{3}$$
E、$$\frac{8}{3}$$

答案：D

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