If 40 men or 60 women or 80 children can do a piece of work in 6 months, then 10 women and 10 children together do half of the work in

If 40 men or 60 women or 80 children can do a piece of work in 6 months, then 10 women and 10 children together do half of the work in
1). $5\frac{6}{13}$ months
2). 6 months
3). $5\frac{7}{13}$ months
4). $11\frac{1}{13}$ months

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