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.)

Question

this is a cal problem.

Answer 1

I did this problem an hour or so ago.

Answer 2

http://www.jiskha.com/display.cgi?id=1310260104

Answer 3

i think u did it wrong

Answer 4

I got the same answer as Damon.
Damon is right.