Task: Question Answering
Input (English): Problem: maxwell leaves his home and walks toward brad ' s house at the same time that brad leaves his home and runs toward maxwell ' s house . if the distance between their homes is 40 kilometers , maxwell ' s walking speed is 3 km / h , and brad ' s running speed is 5 km / h . what is the distance traveled by maxwell when they meet in the middle ? 
Options: a ) 16 , b ) 17 , c ) 18 , d ) 15 , e ) 14
Output (English): d