Question 814703
  <pre><font face = "Tohoma" size = 3 color = "indigo"><b> 
Hi,
&#8745;ne car travels 5 miles per hour faster than "speed "x" of the other car
in the opposite direction
After 4 hours the two cars are 420mi apart
 4x + 4(x + 5mph) = 420mi
   8x = 400
    x = 50mph, speed of slower car, faster car's speed is 55mph
CHECKING our Answer***
 {{{4*50mph + 4*55mph = 420mi}}}