Miriam drives at 40 miles per hour
[tex] \footnotesize\begin{aligned}\bold{FORMULA}\\ \sf{speed = \frac{distance}{time}} \\ \\ \sf \: speed = \frac{320miles}{8hour} \\ \\ \sf \: speed = 40 \frac{miles}{hour} \\ \\ \textsf{Miriam drives at 40 miles per hour}\end{aligned}[/tex]
