Question 870253
Melinda is lying on the beach sunbaking and notices a light aircraft flying overhead.  The aircraft is flying at a constant altitude of 1200m.

height of plane , h =1200m

Melinda observes the plane directly overhead and then
20 seconds later  the angle of elevation to the aircraft is 52°.

Tan 52 = h/x
x=1200/tan 52 degrees
x= 938 meters