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Homework Statement
At noon, ship A is 50km west of ship B. Ship A is sailing south at 30km/h and ship B is sailing north at 20km/h. How fast is the distance between the ships changing at 4:00pm in km/h.
Homework Equations
The Attempt at a Solution
http://img822.imageshack.us/img822/2420/shipq2.png
but the final answer is coming out wrong
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