1. The problem statement, all variables and given/known data A man 6 feet tall walks away from a streetlight that is 18 feet tall. If the length of his shadow is changing at a rate of 3 feet per second when he is 25 feet away from the base of the light, how fast is he walking away from the light at this moment? 2. Relevant equations Trying to figure it out. 3. The attempt at a solution Diagram drawn to no avail.