Task: Question Answering
Input (English): Problem: on a trip , a cyclist averaged 8 miles per hour for the first 16 miles and 10 miles per hour for the remaining 16 miles . if the cyclist returned immediately via the same route and took a total of 6.8 hours for the round trip , what was the average speed ( in miles per hour ) for the return trip ? 
Options: a ) 9 , b ) 10 , c ) 11 , d ) 12 , e ) 13
Output (English): b