Since you are trying to figure out how many miles she can drive in 1 hour and you already have half of that hour, all you would need to do is double that number.
[tex] \frac{4}{5} [/tex] × [tex] \frac{2}{1} [/tex]= [tex] \frac{8}{5} [/tex]
Now, all you would need to do is simplify the answer.
[tex] \frac{8}{5} [/tex] = 1 [tex] \frac{3}{5} [/tex] or 1.6
The answer would be, Suzy can drive 1 [tex] \frac{3}{5} [/tex] or 1.6 miles in 1 hour.
I hope this helps!