Question 433151
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Hi
One car's rate is 20 kilometers per hour more than the other's.
Let x and (x+20)represent the rates of the two vehicles respectively
Question states***
Two cars leave towns 480 kilometers apart at the same time and 
travel toward each other, meeting in 3hrs.  D = r*t
 3x + 3(x+20) = 480
    6x = 420
     x = 70kmph.  the rate of the faster car is 90kmph

CHECKING our Answer***
 3hr*70kmph + 3hr*90kmph = 210km + 270km = 480km