Task: Question Answering
Input (English): Problem: 3 machines operating independently , simultaneously , and at the same constant rate can fill a certain production order in 44 hours . if one additional machine were used under the same operating conditions , in how manyfewerhours of simultaneous operation could the production order be fulfilled ? 
Options: a ) 6 , b ) 9 , c ) 12 , d ) 11 , e ) 48
Output (English): d