Read the following SAT test question and then click on a button to select your answer.

Hareg's motorcycle uses 1 gallon of gas for every 30 miles traveled when traveling at an average speed of 60 miles per hour. The motorcycle's gas tank has 5 gallons at the beginning of a trip. If Hareg's motorcycle travels at an average speed of 60 miles per hour, which of the following functions best models the number of gallons of gas, g(h), remaining in the tank h hours after the trip begins?

(A) g(h)= 5-2h
(B) g(h)= 5-2/h
(C) g(h)= (5-60h)/30
(D) g(h)= (5-30h)/60

来源:可可英语 http://www.kekenet.com/sat/201603/433020.shtml