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? Select:	A) 20	B) 21	C) 22	D) 23	E) 24

Rationale: the volume the box is : length * width * depth = 7 * 6 * 2 = 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 b .
Answer: B