Homework Help: math

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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