To measure the height of the cloud cover at an airport, a worker shines a spotlight upward at an angle $75°$ from the horizontal. An observer $D = 500 m$ away measures the angle of elevation to the spot of light to be $45°$. Find the height $h$ of the cloud cover. (Round your answer to the nearest meter.)
So what I did was take the tangent of both angles:
What do I do next? I tried using substitution but I got $h=~105.7$ which is wrong.