Task: Question Answering
Input (English): Problem: a person can row at 9 kmph and still water . he takes 3 1 / 2 hours to row from a to b and back . what is the distance between a and b if the speed of the stream is 1 kmph ? 
Options: a ) 32 , b ) 28 , c ) 29 , d ) 54 , e ) 16
Output (English): e