Sand is poured into a box so that the box is being filled at the rate of 4 cubic feet per hour. If the empty rectangular box is 7 feet long, 6 feet wide, and 2 feet deep, approximately how many hours does it take to fill the box?
Choose the most appropriate option.
A) 20 B) 21 C) 22 D) 23 E) 24
The volume the box is: length*width*depth = 7*6*2= 
<gadget id="calculator">7*6*2</gadget>
<output>84</output>
84 cubic feet.   84 cubic feet / 4 cubic feet per hour= 21 hours.   It will take 21 hours to fill the box.   The answer is 21.
<result>B</result>
Sand is poured into a box so that the box is being filled at the rate of 4 cubic feet per hour. If the empty rectangular box is 7 feet long, 6 feet wide, and 2 feet deep, approximately how many hours does it take to fill the box?