Question 393684
  <pre><font size = 3 color = "indigo"><b>
Hi
Let x represent the amount of time  before the plane overtakes the car
D = r*t, distance traveled the same for both car and plane
Question States***
 80mph(x + 1hr) = 400mph*x
solving for x
        80 = 320x
         x = 1/4hr, the amount of time  before the plane overtakes the car
CHECKING our Answer
  80*5/4 = 1/4*400 = 100mi  (the distance traveled by both when plane passes)