Question 1112563
Pam sees a hot-air balloon at an altitude of 520m with an angle of elevation of 42°24'. Four minutes later, it has drifted in a straight line towards Pam, at the same altitude, so that it then has an angle of elevation of 67°10'.

a) How far had it drifted?
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It's a right triangle.  The tangent of the angle = y/x = height/distance.
Find the 2 distances, subract.
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b)At what speed was the hot-air balloon travelling? 
To find meters/minute, divide the meters by the minutes.