Task: Question Answering
Input (English): Problem: at their respective rates , pump a , b , and c can fulfill an empty tank , or pump - out the full tank in 2 , 3 , and 6 hours . if a and b are used to pump - out water from the half - full tank , while c is used to fill water into the tank , in how many hours , the tank will be empty ? 
Options: a ) 2 / 3 , b ) 1 , c ) 3 / 4 , d ) 3 / 2 , e ) 2
Output (English): c