"At noon, ship A is 40 miles due west of ship B. Ship A is sailing west at 23 mph and ship B is sailing north at 25 mph. How fast (in mph) is the distance between the ships changing at 6 PM?" I get how I can get the side lengths, and the rates of change for base and height is given, but I can't find out to get the rate of change for the hypotenuse.

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