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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 - ,

    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 - ,

    pot it.

  • math - ,

    Thanks a lot

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