A compact car uses 15 gallons of fuel in traveling 360 miles. In order for the truck to travel the same distance using 12 gallons of fuel, by how many miles per gallon must the car’s fuel mileage be increased? Choose the correct option:
A) 10  B) 6  C) 15  D) 36  E) 27
There are two sets 15G1 gallons and 12G2 gallons details given.   15 gallons covering 360 miles   Then 1 G1 is used to cover 24 miles.   Now for 12, G2 covering 360 miles.   then 1 G2 is used to cover 30 miles.   Therefore, 30 - 24 = 6 miles per gallon increment is needed for 12 gallons to improve the mileage to cover 360 miles.   Thus, 6 is the correct answer.
<result>B</result>
A compact car uses 15 gallons of fuel in traveling 360 miles. In order for the truck to travel the same distance using 12 gallons of fuel, by how many miles per gallon must the car’s fuel mileage be increased?