# A weather balloon is rising vertically at the rate of 10ft/s. An observer is standing on the ground 300 ft, horizontally from the point where the balloon was released. At what rate is the distance between the observer and the balloon changing when the balloon is 400ft high?

Question

A weather balloon is rising vertically at the rate of 10ft/s. An observer is standing on the ground 300 ft, horizontally from the point where the balloon was released. At what rate is the distance between the observer and the balloon changing when the balloon is 400ft high?

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MathCalculus