Task: Question Answering
Input (English): Problem: two pipes a and b can separately fill a tank in 8 and 10 minutes respectively . a third pipe c can drain off 15 liters of water per minute . if all the pipes are opened , the tank can be filled in 10 minutes . what is the capacity of the tank ? 
Options: a ) 590 liters , b ) 160 liters , c ) 740 liters , d ) 560 liters , e ) 120 liters
Output (English): e