An oil tank has to be drained for maintenance. the tank is shaped like a cylinder that is 5 ft long with a diameter of 1.8 ft . suppose oil is drained at a rate of 2.1 ft3 per minute. if the tank starts completely full, how many minutes will it take to empty the tank? use the value 3.14 for π , and round your answer to the nearest minute. do not round any intermediate computations.