One man, 3 women and 4 boys can do a piece of work in 96 h, 2 men and 8 boys can do it in 80 h, 2 men and 3 women can do it in 120 h. 5 men and 12 boys can do it in :

• A. 39 1/11 h
• B. 42 7/11 h
• C. 43 7/11 h
• D. 44 h