First we have to set up the inequality that convey the information given. Notice that the total cost for the car if you rent it from :
Company A is $109 no matter the mileage
Company B is m($0.80)+$65
Then the inequality to solve is:
$109[tex]\begin{gathered} 109-65<\text{ m}\cdot0.80 \\ \frac{44}{0.80}
Then we can conclude that for m>55 Company A charges less than Company B.