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A street light is mounted at the top of a 15-ft-tall pole. A man 6 feet tall walks away from the pole with a speed

A street light is mounted at the top of a 15-ft-tall pole. A man 6 feet tall walks away from the pole with a speed of 7 ft/s along a straight path. How fast (in ft/s) is the tip of his shadow moving when he is 40 feet from the pole?

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