math

Two cars leave Phoenix and travel in the same direction. One car travels 4/3
times as fast as the other.
After 6 hours they are 90 miles apart. What are the rates of the cars?

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  1. speed of slower car --- x mph
    speed of faster car ---- (4/3)x

    they both went for 6 hours

    6(4/3)x - 6x = 90
    8x - 6x = 90
    2x = 90
    x = 45 mph

    slower car: 45 mph
    faster car: 60 mph

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