Correct. Find the mean for each data set:

Leaving at 7 a.m.: $\displaystyle\frac{{{32}+{28}+{35}+{26}+{39}}}{{5}}={32}\usepackage{cmbright}\Huge\$

Leaving at 8 a.m.: $\displaystyle\frac{{{46}+{44}+{52}+{50}+{48}}}{{5}}={48}\usepackage{cmbright}\Huge\$

The difference between these averages is $\displaystyle{48}-{32}={16}\usepackage{cmbright}\Huge\$ , or 16 minutes.