SOLUTION: Two cars travel towards each other from points 400 km apart. The two cars meet in 4 hours. What is the average speed of each car if one car travels 20 km per hour faster than the o

Question 1170583: Two cars travel towards each other from points 400 km apart. The two cars meet in 4 hours. What is the average speed of each car if one car travels 20 km per hour faster than the other?
Answer by ikleyn(52781) (Show Source): You can put this solution on YOUR website!
.


Let the slower car rate be x km/h;

then the faster car rate is  (x+20) km/h.


The total distance equation is

    4x + 4*(x+20) = 400  kilometers.


Simplify and find x

    4x + 4x + 80 = 400

    8x           = 400 - 80 fa

    8x           = 320

     x           = 320/8 = 40.


ANSWER.  The slower car rate is  40 km/h;  the faster car rate is 40+20 = 60 km/h.

Solved.

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