A swimming pool is 15 ft by 30 ft and an average of 5 ft in depth. It takes 25 minutes longer to fill than to drain the pool. If it can be drained at a rate of 18 ft 3 /min faster than it can be filled, what is the drainage rate? Please give the answer to one decimal places.
?

A. 55.6 ft 3 /min
B. 50.2 ft 3 /min
C. 43.9 ft 3 /min
D. 43.0 ft 3 /min
E. 32.2 ft 3 /min


Answer: B

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