Task: Question Answering
Input (English): Problem: a swimmer can swim in still water at 4 km / h . if the speed of the water current is 2 km / h , how many hours will the swimmer take to swim against the current for 3 km ? 
Options: a ) 1.5 , b ) 1.75 , c ) 2.0 , d ) 2.25 , e ) 2.5
Output (English): a