Task: Question Answering
Input (English): Problem: a person can row at 9 kmph and still water . he takes 7 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 ) 60 km , b ) 87 km , c ) 33 km , d ) 67 km , e ) 20 km
Output (English): c