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Question: A street light is mounted at the


A street light is mounted at the top of a 15-ft-tall pole. A man 6 ft tall walks away from the pole with a speed of 5 ft/s along a straight path. How fast is the tip of his shadow moving when he is 40 ft from the pole?
(a). What quantities are given in the problem?
(b). What is the unknown?
(c). Draw a picture of the situation for any time t.
(d). Write an equation that relates the quantities.
(e). Finish solving the problem.

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