Task: Question Answering
Input (English): Problem: bexy walks 5 miles from point a to point b in one hour , then bicycles back to point a along the same route at 15 miles per hour . ben makes the same round trip , but does so at half of bexy ’ s average speed . how many minutes does ben spend on his round trip ? 
Options: a ) 40 , b ) 80 , c ) 120 , d ) 160 , e ) 180
Output (English): d