A segment is 3 units long. it is divided into 9 parts. what fraction of a unit are 2 parts pf the segmant ?

Length of segment = 3 units
Number of parts in a segment = 9 parts
So, length of each part = $\frac{3}{9}=\frac{1}{3}$ unit
Therefore, length of 2 parts of a segment = $2\times \frac{1}{3}=\frac{2}{3}$ unit