Task: Question Answering
Input (English): Problem: a cistern is filled by a tap in 8 1 / 2 hours . due to leak in the bottom of the cistern , it takes half an hour longer to fill the cistern . if the cistern is full how many hours will it take the leak to empty it ? 
Options: a ) 133 , b ) 143 , c ) 153 , d ) 163 , e ) 173
Output (English): c