Get out a piece of paper and draw the situation. You have two right triangles. Each have two points that are the same (the top and bottom of the bulding), but the third points (where the observer is located) are different. Let H be the height of the building, in feet. Point A is X ft away and point B is A - 600 feet away.
Solve those two simultaneous equations:
H/X = tan 24.1
H/(600-X) = tan 30.2
As a first step in solving them, you can solve for X first, using
(600-X)/X = tan 30.2/tan 24.1 = 1.3011
(I used a calculator for that)
780.67 = 2.3011 X
X = 339.3 ft
Now use either of the first two equations to solve for H.
look at the non-right-angles triangle, with its top angle at the top of the building.
That top angle can be easily found to be 6.1 degrees. We can find the side coming up from the 30.2 degree angle, call it y
by sine law
y/sin24.1 = 600/sin6.1
y = 2305.56
then in the small right-angled triangle
sin 30.2 = H/y
H = 2305.56sin30.2
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