so this problem just wants us to find 2/3 of 7/8
'of' means multiply
so 2/3 of 7/8 just means 2/3 times 7/8
remember
[tex]\frac{a}{b}[/tex] times [tex]\frac{c}{d}[/tex] equals [tex]\frac{ac}{bd}[/tex]
so
[tex]\frac{2}{3}[/tex] times [tex]\frac{7}{8}[/tex] equals [tex]\frac{(2)(7)}{(3)(8)}=\frac{14}{24}=\frac{7}{12}[/tex]
drake walked 7/12 miles