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 the rest of the trip . if the average speed for the entire trip is 34 miles per hour , how many hours long is the trip ? 
Options: a ) 6.5 , b ) 7.5 , c ) 8.5 , d ) 9.5 , e ) 10.5
Output (English): b