X and Y together can do a work in \(2 \frac{2}{5}\) days, Y and Z together can do the same work in 3 days, and X and Z together can do the same work in 4 days. The time taken by X, Y and Z together to do the same work is:
1
\(\frac{1}{2}\) day
2
1 day
3
2 days
4
\(2 \frac{1}{2}\)