A streetlight, 20 feet in height, stands 5 feet from a sidewalk. A person, 6 feet tall, walks along the sidewalk at 4 ft/sec. At what rate is the length of the person’s shadow changing when the person is 13 feet from the base of the street-light?

Question

A streetlight, 20 feet in height, stands 5 feet from a sidewalk.  A person, 6 feet tall, walks along the sidewalk at 4  ft/sec.  At what rate is the length of the person’s shadow changing when the person is 13 feet from the base of the  street-light?

goformit100 · Answer

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