Task: Question Answering
Input (English): Problem: a cistern is fille in 8 hours and it takes 12 hours when there is a leak in its bottom . if the cistern is full , in what time shall the leak empty it ? 
Options: a ) 22 hours , b ) 21 hours , c ) 24 hours , d ) 23 hours , e ) 25 days
Output (English): c