Task: Question Answering
Input (English): Problem: the pilot of a small aircraft with a 40 - gallon fuel tank wants to fly to cleveland, which is 480 miles away. the pilot recognizes that the current engine, which can fly only 6 miles per gallon, will not get him there. by how many miles per gallon must the aircraft ’ s fuel efficiency be improved to make the flight to cleveland possible ?
Options: a. 2, b. 4, c. 12, d. 6, e. 160
Output (English): d