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Math Help - Traveling problem

  1. #1
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    Traveling problem

    While you are traveling in a car on a straight, level inter-state highway at 90 km/h, another car passes you in the same direction; its speedometer reads 120 km/h. (a) What is your velocity relative to the other driver? (b) What is the other car's velocity relative to you?
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  2. #2
    Grand Panjandrum
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    Quote Originally Posted by Dora
    While you are traveling in a car on a straight, level inter-state highway at 90 km/h, another car passes you in the same direction; its speedometer reads 120 km/h. (a) What is your velocity relative to the other driver? (b) What is the other car's velocity relative to you?
    Your velocity relative to the other driver is v_y-v_o, where
    v_y is your velocity, and v_o is the other driver's velocity. So:

    a) 90-120 = -30 km/hr

    The other cars velocity with respect to you is v_o-v_y, so:

    b) 120-90 = 30 km/hr.

    RonL
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