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Math Help - An Average Velocity Problem

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    An Average Velocity Problem

    A driver sets out on a journey. For the first half of the distance she drives at the leisurely pace of 30 mph; she drives the second half at 60 mph. What is her average speed for the trip. Solve the problem algebraically using the formula D=r*t.
    Last edited by Ackbeet; August 24th 2011 at 05:02 PM.
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    Re: An Average Velocity Problem

    Quote Originally Posted by joojoa94 View Post
    A driver sets out on a journey. For the first half of the distance she drives at the leisurely pace of 30 mph; she drives the second half at 60 mph. What is her average speed for the trip. Solve the problem algebraically using the formula D=r*t.
    first half ...

    t_1 = \frac{d/2}{30} = \frac{d}{60}

    second half ...

    t_2 = \frac{d/2}{60} = \frac{d}{120}

    v_{avg} = \frac{d}{t_1+t_2}

    finish it ...
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