Task: Question Answering
Input (English): Problem: the time taken by a man to row his boat upstream is twice the time taken by him to row the same distance downstream . if the speed of the boat in still water is 54 kmph , find the speed of the stream ? 
Options: a ) 77 , b ) 18 , c ) 14 , d ) 12 , e ) 17
Output (English): b