Task: Question Answering
Input (English): Problem: a man can row 4.2 km / hr in still water . it takes him twice as long to row upstream as to row downstream . what is the rate of the current ? 
Options: a ) 1.9 , b ) 1.7 , c ) 1.4 , d ) 1.5 , e ) 1.1
Output (English): c