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A rocket, rising vertically, is being tracked by a radar station miles away. How fast is the rocket rising when it is miles above the ground and the distance between the rocket and the radar station is increasing at a rate of miles per hour?

Draw a diagram and use it to write an equation.

Differentiate your equation from Step 1.
What is the value of when ?

Evaluate your equation from Step 2 for , (# from Step 3), and .