Car A traveled 55 miles per hour. Now, how I got this is with the distance= rate *time equation. You can send me a message if you need a more detailed explanation. Hope this helped.
To find the value of , we need to isolate it. In this case, we can do so by dividing it by , and what we do to one side of the equation, we have to do to the other. So, divide both sides of the equation by .