Question 623179
This question cannot be solved with the information that is given.
Question says 6 men and 9 women take 10 days. There is no way to tell 
whether the men work faster or the women. 

So, we cannot say the time required for 8 men and 3 women.
However, for 8 men and 12 women, it will be 7.5 days
and for 2 men and 3 women, it will be 30 days.