(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

A balloon rises at the rate of 8 ft/s from a point on the ground 60 feet from an observer. Find the rate of change of the angle of elevation when the balloon is 25 feet above the ground.

2. Relevant equations

n/a

3. The attempt at a solution

i tried several times and erased...

but...

I tried d/dt 'ing tanX = h/60 and solving for dx/dt but that gave me a number way off from the answer.

I get (secX)^2 * dx/dt = 8/60 (because dh/dt = 8)

The answer is supposed to be about .114 radians/second.

EDIT: I solved it myself, finally...

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# Related Rate Problem involving Theta

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