A Swimming Pool Is 15 Ft by 30 Ft and an Average

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