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At noon, ship A is 40 nautical miles due west of ship B. Ship A is sailing west at 16 knots and ship B is

At noon, ship A is 40 nautical miles due west of ship B. Ship A is sailing west at 16 knots and ship B is sailing north at 21 knots. How fast (in knots) is the distance between the ships changing at 7 PM? (Note: 1 knot is a speed of 1 nautical mile per hour.)

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