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Math Help - Related rates.

  1. #1
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    Related rates.

    The question goes like this:

    A highway patrol plane flies 3 miles above a level, straight road at a steead 120 miles per hour. The pilot sees an oncoming car and with radar determines that at the instant the line of sight distance from plane to car is 5 miles, the line of sight distance is decreasing at the rate of 160 miles per hour. Find the speed of the car along the highway.

    I am stucked at forming the equations. Please help thanks
    Last edited by mr fantastic; August 18th 2011 at 06:22 AM. Reason: Re-titled.
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  2. #2
    MHF Contributor
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    Re: Any expert can solve this?

    http://www.mathhelpforum.com/math-he...tml#post414469

    However, there is a typo in the key there for



    ... the chain rule. Which should read, straight continuous lines differentiate downwards (integrate up) with respect to the main variable (in this case t), and the straight dashed line similarly but with respect to the dashed balloon expression (the inner function of the composite which is subject to the chain rule).
    Last edited by tom@ballooncalculus; August 18th 2011 at 04:07 AM.
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