Task: Question Answering
Input (English): Problem: calculate how long it will take a swimmer to swim a distance of 7 km against the current of a river which flows at 2.5 km / hr , given that he can swim in still water at 4.4 km / h 
Options: a ) 6.67 , b ) 1.67 , c ) 2.67 , d ) 3.67 , e ) 4.67
Output (English): d