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)=23020
x+y=70
Speed of one is 10 km less than the other:
xy=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.

math  jojo, Friday, December 18, 2015 at 11:16am
Thanks a lot
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