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6. A circular swimming pool has a diameter of 24 ft. and a water height of 3.5 ft. A pump can fill the pool at a rate of 1.2 ft cubed (9 gallons) per minute. About how long it will take to fill this pool ( in hours)?


A. About 15 hours

B. About 1300 hours

C. About 88 hours

D. About 22 hours