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October 22nd, 2012, 09:47 PM   #1
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Rate of Change

Two roads intersect at right angles. A man stands 33 meters south of intersection, watching a cyclist traveling eastwards at 14meters/s . At what speed is the cyclist moving away from the observer, 4 seconds after passing the intersection?
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October 22nd, 2012, 10:13 PM   #2
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Re: Rate of Change

Draw a diagram and use the Pythagorean theorem. Implicitly differentiate with respect to time t, then solve for the result you seek, then plug in the given data.
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