Simply put, this question is asking "What is 2/3 of 2 2/5 ?".
If we want to find 2/3 of 2 2/5, we can multiply the fractions together.
[tex] \frac{2}{3} * 2 \frac{2}{5} [/tex]
= [tex] \frac{24}{15} [/tex]
= [tex] \frac{8}{5} [/tex]
= [tex]1 \frac{3}{5} [/tex]
This means that Maggie and her friend have walked [tex] 1 \frac{3}{5} [/tex] kilometers of the beach shoreline.