Task: Question Answering
Input (English): Problem: a man can row downstream at the rate of 10 km / hr and upstream at 4 km / hr . find man ' s rate in still water and the rate of current ? 
Options: a ) 9,6 , b ) 7,3 , c ) 9,3 , d ) 6,6 , e ) none of these
Output (English): b