We have the following:
The area of a rectangle is
[tex]\begin{gathered} A=l\cdot w \\ l=\frac{A}{w} \end{gathered}[/tex]where w is width, A is area and l is length
replacing:
[tex]\begin{gathered} l=\frac{4}{17} \\ l=0.235 \end{gathered}[/tex]Therefore, the length is 0.235 meters