From the ground level, Kevin released a balloon which rises at a constant rate of 2 feet per

second. Alexis stands at the top of a 100-foot observation tower located 60 feet from the point

where the balloon was released. At what rate is the distance between Alexis and the balloon

changing at the instant when the balloon is 55 feet above the ground? [Note: You are required

to draw a properly labeled diagram for this problem.

 

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