Water is poured into a tank so that the tank is being filled at the rate of 5 cubic feet per hour. If the empty rectangular tank is 10 feet long, 6 feet wide, and 5 feet deep, approximately how many hours does it take to fill the tank?  Choose the correct choice from the following.
A) 40 B) 45 C) 50 D) 55 E) 60

Rationale: the volume the tank is : length * width * depth = 10 * 6 * 5 = 300 cubic feet . 300 cubic feet / 5 cubic feet per hour = 60 hours . it will take 60 hours to fill the tank . the answer is e .
Answer: E