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Math Help - how fast does the shadow move

  1. #1
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    how fast does the shadow move

    A street light is at the top of a 18 ft tall pole. A woman 6 ft tall walks away from the pole with a speed of 8 ft/sec along a straight path. How fast is the tip of her shadow moving when she is 40 ft from the base of the pole?

    can someone help me set this up
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  2. #2
    Behold, the power of SARDINES!
    TheEmptySet's Avatar
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    Here is a diagram that should help
    how fast does the shadow move-triangle.jpg

    Use similar triangles to find a relationship between x and y.
    I hope this helps
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