Task: Question Answering
Input (English): Problem: a car averages 30 miles per hour for the first 5 hours of a trip and averages 42 miles per hour for each additional hour of travel time . if the average speed for the entire trip is 38 miles per hour , how many hours long is the trip ? 
Options: a ) 13 , b ) 14 , c ) 15 , d ) 16 , e ) 17
Output (English): c