Here as per figure we need to find the base of the triangle
here we know that the angle of elevation is 50 degree
Now from this triangle we have
Base = L
Height = 305.5 ft
now from trigonometry we have
[tex]tan\theta = \frac{opposite side}{adjacent side}[/tex]
now we have
[tex]tan50 = \frac{305.5}{L}[/tex]
[tex]L = \frac{305.5}{tan50}[/tex]
[tex]L = 256.3 ft[/tex]
so image of tip will be at distance 256.3 ft away from base