advance geometry

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A plane is flying east, ascending at a constant angle. Jack is standing on the ground, watching the plane come to (horizontally) directly at him. When he first sees the plane, at an angle of elevation of 15 degrees, its horizontal distance from him is 11,000. When he sees it again, at an angle of elevation of 35 degrees, its horizontal distance from him is now only 7,ooo away.
-What is the angle thatthe plane is ascending at?
-When the plane is directly over jack, What is it's altitude?
-Hint: use similar triangles
find X
Find Y

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