Please help I need the answer right away because I don't know if I got the right answer I will provide positive feedback

Consider the following prompt: A pebble is dropped into a calm pond, causing ripples in the form of concentric circles. The area A of the outer ripple is increasing at a constant rate of 5 feet squared per second. When the radius is 6 feet, at what rate is the radius r of the disturbed water changing? If necessary, round your answer to two decimal places. What is the appropriate differential equation use to solve this question? O dt dA - 2TT at dA - 2TT dr A = 27TH O dA _ 2Ar dt