Task: Question Answering
Input (English): Problem: it takes joey the postman 1 hours to run a 2 mile long route every day . he delivers packages and then returns to the post office along the same path . if the average speed of the round trip is 5 mile / hour , what is the speed with which joey returns ? 
Options: a ) 10 , b ) 12 , c ) 13 , d ) 14 , e ) 15
Output (English): a