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Mathematics 10 Online
OpenStudy (anonymous):

The lookout on board a ship spots an unknown ship on the open seas and immediately alerts Chris, the ship's captain. The unknown ship is currently 4 miles south and 3 miles east of Captain Chris's ship, and it is at that moment sailing due west at 20 mph. Captain Chris's ship, meanwhile, is at that moment sailing due north at 16 mph. Is the distance between Captain Chris's ship and the unknown ship increasing or decreasing? How fast? (Distance is measured along a straight line joining the two ships.)

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