15 = 3t
Joe’s car has a 15 gallon fuel tank and an average fuel economy of 20 miles per gallon. He is planning a road trip where he’ll be driving on the freeway at 60 miles per hour for many hours. The equation above represents the time t (in hours) that it will take for his tank to be empty. What does the 3 represents?

A 3 is the product of his car’s fuel economy and the number of hours

B 3 is the ratio of his speed and his car’s fuel economy.

C 3 is the product of his car’s fuel tank capacity and his speed

D 3 is the ratio of his car’s fuel tank capacity and his fuel economy.