uming the plane keeps the same elevation, by how far will the plane clear the tower?

You are lying down 24 yards in front of a 51 yard tall tower on flat land. You spy an airplane flying level some distance above the tower in line with and heading toward you and the tower. At this moment the front of the plane is at an angle of elevation of 33� from you. From the pilots vantage point, the top of the tower is at an angle of depression of 16�. uming the plane keeps the same elevation, by how far will the plane clear the tower?