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.

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

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

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

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

Damon is right.

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