Question 1112562
That means, the angle of depression at the top flashling light is 82.03 degrees and the angle of depression at the bottom flashing light is 82.875 degrees.


Draw the picture to see.
Two right triangles share a base side of 5000 feet.
Smaller triangle has angles 90, 7.97, and 82.03 degrees.
Larger triangle has angles  90, 7.125, and 82.375 degrees.


If Top of the tower light is T above ground level and the bottom light is B above ground level, then

{{{system(T/sin(7.97)=5000/sin(82.03),and,B/sin(7.125)=5000/sin(82.875))}}}


Find T, find B, and then the difference {{{T-B}}}.