Posted by lisa on Saturday, July 9, 2011 at 10:26pm.
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 15 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.)
this is a cal problem.

math  Damon, Saturday, July 9, 2011 at 10:34pm
I did this problem an hour or so ago.

math  Damon, Saturday, July 9, 2011 at 10:34pm
http://www.jiskha.com/display.cgi?id=1310260104

math  lisa, Saturday, July 9, 2011 at 11:17pm
i think u did it wrong

math  Reiny, Sunday, July 10, 2011 at 12:22am
I got the same answer as Damon.
Damon is right.
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