A variation of an old standard
Just change the numbers to yours
http://www.jiskha.com/display.cgi?id=1332891707
At noon, ship A is 10 nautical miles due west of ship B. Ship A is sailing west at 24 knots and ship B is sailing north at 19 knots. How fast (in knots) is the distance between the ships changing at 6 PM?
1 answer