Posted by **simon** on Thursday, March 8, 2012 at 2:51am.

the distance between 2 station A and B is 230 km .two car start simultaneously from A and B in the opposite directions and the distance between them after 3 houra is 20 km. If the speed of one car is less than that of the other by 10 km per hour, find the speed of each cars. (equation)

- math -
**MathMate**, Thursday, March 8, 2012 at 9:41am
Let x and y be the two speeds, x>y.

First part:

after 3 hours of driving towards each other, the distance is reduced from 230 to 20, so

3(x+y)=230-20

x+y=70

Speed of one is 10 km less than the other:

x-y=10

We have a sum and difference problem where the solution is

x=(sum+difference)/2=40

y=(sum=difference)/2=30

- math -
**Henry**, Friday, March 9, 2012 at 9:17am
pot it.

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