Task: Question Answering
Input (English): Problem: 3 pumps , working 8 hours a day , can empty a tank in 2 days . how many hours a day should 4 pumps work in order to empty the tank in 1 day ? 
Options: a ) 10 , b ) 12 , c ) 8 , d ) 15 , e ) 18
Output (English): b