A street light is mounted at the top of a 15 foot pole. A man 6 feet tall walks away from the pole with a speed of 5 ft/sec along a straight path. How fast is the tip of his shadow moving when he is 40 feet from the pole?

What would be the process used to solve this problem and related rates in general? I dont necessarily care about the answer more the solution, showing how to solve these kinds of problems. Thanks!

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