A tank with a volume of 20 cubic feet has one inlet pipe and 2 outlet pipes. The inlet pipe fills water into the tank at the rate of 5 cubic inches/min and the 2 outlet pipes empty it out at the rates of 9 cubic inches/min and 8 cubic inches/min respectively. If all 3 pipes are opened when the tank is full, how many minutes does it take to empty the tank? (1 foot = 12 inches) Choices:
A) 2110	B) 2220	C) 2440	D) 2660	E) 2880
The tank is emptied at this rate: 9 + 8 - 5= 
<gadget id="calculator">9 + 8 - 5</gadget>
<output>12</output>
12 cubic inches/min   The tank has a volume of  20*12*12*12= 
<gadget id="calculator"> 20*12*12*12</gadget>
<output>34_560</output>
34560 cubic inches.   The time it takes to empty the tank is 34560/12= 
<gadget id="calculator">34560/12</gadget>
<output>2_880</output>
2880 minutes.   The answer is 2880.
<result>E</result>
A tank with a volume of 20 cubic feet has one inlet pipe and 2 outlet pipes. The inlet pipe fills water into the tank at the rate of 5 cubic inches/min and the 2 outlet pipes empty it out at the rates of 9 cubic inches/min and 8 cubic inches/min respectively. If all 3 pipes are opened when the tank is full, how many minutes does it take to empty the tank? (1 foot = 12 inches)