I need help with this problem!! It would be much appreciated!!
A street light is mounted at the top of a 15 foot-tall pole. A man 6ft tall walks away from the pole with the speed of 5ft/s along a straight path. How fast is the tip of his shadow moving away from the pole when he is 40ft from the pole?

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Right, and I think we have to use similar triangles, correct?

Yes! lets start by labelling stuff

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