Task: Question Answering
Input (English): Problem: a certain car can travel 40 kilometers on a liter of fuel . if the fuel tank ’ s contents decrease by 3.9 gallons over a period of 5.7 hours as the car moves at a constant speed , how fast is the car moving , in miles per hour ? ( 1 gallon = 3.8 liters ; 1 mile = 1.6 kilometers ) 
Options: a ) 52 , b ) 65 , c ) 78 , d ) 91 , e ) 104
Output (English): b