Write the missing number that correctly completes the word problem:

The distance from Darla's home to her school is $\displaystyle{16}\frac{{1}}{{2}}\usepackage{cmbright}\Huge\$ miles. A book store is $\displaystyle\frac{{1}}{{3}}\usepackage{cmbright}\Huge\$ of that distance from her home, which is $\displaystyle{5}\frac{{1}}{?}\usepackage{cmbright}\Huge\$ miles.