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Homework Statement
A man 6m tall walks away from a light 10m above the ground. If his shadow lengthens at a rate of 2m/s, how fast is he walking?
Homework Equations
The Attempt at a Solution
I have nothing.
Look at the picture I attached. The relationship between ratios is constant, therefore the relationship between speed of man and length of shadow is constantbut how can i use similar triangles if i only have one of the dimensions of the triangle?