Question: How do I answer this question? 7. A stone is dropped into some water and a circle of radius r is formed and slowly expands.

How do I answer this question?

7. A stone is dropped into some water and a circle of radius r is formed and slowly expands. The perimeter of the circle is increasing at 3 m/ 5. At the moment the radius is exactly 2m, what rate is the radius of the circle increasing

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