Task: Question Answering
Input (English): Problem: a runner runs the 40 miles from marathon to athens at a constant speed . halfway through the run she injures her foot , and continues to run at half her previous speed . if the second half takes her 11 hours longer than the first half , how many hours did it take the runner to run the second half ? 
Options: a ) 14 , b ) 15 , c ) 18 , d ) 22 , e ) 33
Output (English): d