Balloon B is 3910 feet above balloon A.
Step-by-step explanation:
The figure for the given scenario is shown below.
From the figure,
QR is the distance of balloon A or B from Charlie, SR is the distance of balloon A from ground, is the angle of elevation of balloon A, is the angle of elevation of balloon B. S is the position of balloon A and P is the position of balloon B.
So, as per the question,
SR = 1200 ft, °, °.
From triangle ΔSQR,
Now, consider triangle ΔPQR.
Now, difference in the height of balloon A and B is given by the segment PS.
So,
Therefore, the balloon B is 3910 feet above balloon A.