TeX source:

\text { slope }=v_{\mathrm{Q}}=\frac{\Delta x_{\mathrm{Q}}}{\Delta t_{\mathrm{Q}}}=\frac{(3120 \mathrm{~m}-1300 \mathrm{~m})}{(32 \mathrm{~s}-19 \mathrm{~s})}