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A street light is on a pole 17 ft tall. A boy 5 ft tall walks away from the pole at a rate of 4

A street light is on a pole 17 ft tall. A boy 5 ft tall walks away from the pole at a rate of 4 ft/sec. At what rate is his shadow lengthening when he is 20 ft from the pole?At what rate (in feet per second) is the tip of his shadow moving?

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