8/11 is multiplying on the left, then it will divide on the right
Dividing by a fraction is the same as multiplying by its inverse, then:
[tex]\begin{gathered} b=\frac{\frac{2}{5}}{\frac{8}{11}} \\ b=\frac{2}{5}\cdot\frac{11}{8} \\ b=\frac{22}{40} \\ b=\frac{11}{20} \end{gathered}[/tex]