Question:
At noon, ship A is 30 nautical miles due west of ship B.
Last updated: 7/19/2022
![At noon, ship A is 30 nautical miles due west of ship B.](https://media.kunduz.com/media/sug-question/raw/45320486-1658266315.880294.jpeg?h=512)
At noon, ship A is 30 nautical miles due west of ship B. Ship A is sailing west at 21 knots and ship B is sailing north at 19 knots. How fast (in knots) is the distance between the ships changing at 4 PM? (Note: 1 knot is a speed of 1 nautical mile per hour.)