A spotlight on the ground is shining on a wall 12m away. If a woman 2 tall walks from the spotlight toward the building at a

Question

A spotlight on the ground is shining on a wall 12m away. If a woman 2 tall walks from the spotlight toward the building at a speed of 0.8m/s, how fast is the length of her shadow on the building decreasing when she is 4m from the building?

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