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March 27, 2017

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Two cars start at the same point at Alexandria, verginia, and travel 2
opposite directions. One car travels 5 miles per hour faster than the
other car. After 4 hours, the two cars are 420 miles apart. Find the
speed of each car.

  • Algebra - ,

    V1 = = X- mi/h
    V2 = (x+5) mi/h.

    d = 4*X + 4*(X+5) = 420
    4x + 4x+20 = 420
    8x = 420-20 = 400
    X = 50 mi/h.
    X+5 = 55 mi/h.

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