Oil Spills Out of a Tanker at the Rate of 145

Multiple Choice

Oil spills out of a tanker at the rate of 145 gallons per minute. The oil spreads in a circle with a thickness of 1/4 inch. Given that 1 ft³ equals 7.5 gallons, determine the rate at which the radius of the spill is increasing when the radius reaches 90 feet.

A) 12.308 ft/min
B) 3.282 ft/min
C) 1.641 ft/min
D) 1.611 ft/min