Question: Two boats leave the same port at the same time, with boat A traveling north at 15 knots (nautical miles per hour) and boat B

Two boats leave the same port at the same time, with boat A traveling north at 15 knots (nautical miles per hour) and boat B traveling east at 20 knots. How fast is the distance between them changing when boat A is 30 nautical miles from port?

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