Task: Question Answering
Input (English): Problem: car z travels 48 miles per gallon of gasoline when driven at a constant rate of 45 miles per hour , but travels 20 percent fewer miles per gallon of gasoline when driven at a constant rate of 60 miles per hour . how many miles does car z travel on 10 gallons of gasoline when driven at a constant rate of 60 miles per hour ? 
Options: a ) 320 , b ) 384 , c ) 400 , d ) 408.3 , e ) 440
Output (English): b