Oil is poured into a tank so that the tank is being filled at the rate of 4 cubic feet per hour. If the empty rectangular tank is 9 feet long, 8 feet wide, and 5 feet deep, approximately how many hours does it take to fill the tank? Choices.
A) 60 B) 70 C) 80 D) 90 E) 100
The volume the tank is: length*width*depth = 9*8*5= 
<gadget id="calculator">9*8*5</gadget>
<output>360</output>
360 cubic feet.   360 cubic feet / 4 cubic feet per hour= 90 hours.   It will take 90 hours to fill the tank.   The answer is 90.
<result>D</result>
Oil is poured into a tank so that the tank is being filled at the rate of 4 cubic feet per hour. If the empty rectangular tank is 9 feet long, 8 feet wide, and 5 feet deep, approximately how many hours does it take to fill the tank?