Stu Dent is standing at one end of a 2000 foot runway when he spots a UFO hovering at height h ft above the runway a horizontal distance x from his position. He measures the angle of elevation of the UFO as 40°. At the same time his sister
Deca Dent is standing at the other end of the runway and sights the angle of elevation of the UFO from her position as 70°
Find hand x.