Task: Question Answering
Input (English): Problem: a person can swim in still water at 6 km / h . if the speed of water 2 km / h , how many hours will the man take to swim back against the current for 14 km ? 
Options: a ) 3.5 , b ) 4.5 , c ) 5 , d ) 9 , e ) 6
Output (English): a