Related Rates: Two people are 50 feet apart. One of them (person A) starts walking north at a rate

Related Rates: Two people are 50 feet apart. One of them (person A) starts walking north at a rate so that the angle shown in the diagram below is changing at a constant rate of 0.01 rad/min. Person B stays still watching person A. At what rate is distance between the two people changing when the angle is 0.2 radians.

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