Task: Question Answering
Input (English): Problem: beginning in town a , biker bob rides his bike 20 miles west , 6 miles north , 10 miles east , and then 18 miles north , to town b . how far apart are town a and town b ? ( ignore the curvature of the earth . ) 
Options: a ) 28 miles , b ) 30 miles , c ) 26 miles , d ) 18 miles , e ) 22 miles
Output (English): c