A certain car can travel 40 minutes on a gallon of gasoline at 80 miles per hour. If the car had started with a full tank and had 8 gallons of gasoline left in its tank at the end, then what percent of the tank was used to travel 80 miles at 80 mph?  Choose the most appropriate option.
A) 15%	B) 16%	C) 25%	D) 30%	E) 40%
Total time for travelling 80 miles @ 60 mph = 80/80= 
<gadget id="calculator">80/80</gadget>
<output>1</output>
1 hour= 60 minutes.   Given, the car uses 1 gallon for every 40 minutes of driving @ 80 mph. Thus in 60 minutes it will use = 1.5 gallons. Thus, full tank = 1.5+8= 
<gadget id="calculator">1.5+8</gadget>
<output>9.5</output>
9.5 gallons ---&gt; 1.5/9.5= 16% of the fuel used. 16% is the correct answer.
<result>B</result>
A certain car can travel 40 minutes on a gallon of gasoline at 80 miles per hour. If the car had started with a full tank and had 8 gallons of gasoline left in its tank at the end, then what percent of the tank was used to travel 80 miles at 80 mph?