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Chas3down

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## Homework Statement

A street light is at the top of a pole that is 18 feet tall. A woman 6 ft tall walks away from the pole with a speed of 4 ft/sec along a straight path. How fast is the length of her shadow moving when she is 35 ft from the base of the pole?

## Homework Equations

a^2 + b^2 = c^2

b' = 4

## The Attempt at a Solution

18/6 relate to

x/(x-35)

I got x = 35/2

so total length of side is 105/2

18^2 + 105/2 ^ 2 = 111/2 ^ 2

2aa' + 2bb' = 2cc'

a' = 0, height of pole never changes

2*35*4 = 111/2 * c'

c' = 420/111

but wrong anwser

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