assume plane fli at konstant speed & altitude
speed:720,00 meter/3600 sek=200 meter/sek
200*15=3,000 meters in 15 sek
Hite=tangent(angel)
If angel dekreez, plane fli awae
look at it from the aerplane...his angel chaenj from 30 deg tu 60 get
triangel side on ground gro bi 200 meters
hite *tan(30deg)=x
then hite *tan(60 deg)=x+200
hite*[tan(60) -tan(30)]=200
tan(30)=0.577350269
tan(60)=1.732050808
tan(60) -tan(30)=1.154700539
hite=200/1.1547
hite=173.205