Task: Question Answering
Input (English): Problem: bruce and anne can clean their house in 4 hours working together at their respective constant rates . if anne ’ s speed were doubled , they could clean their house in 3 hours working at their respective rates . how many d hours does it currently take anne to clean the house on her own ? 
Options: a ) 6 , b ) 7 , c ) 8 , d ) 12 , e ) 14
Output (English): d