Posted by Stuck on Wednesday, June 16, 2010 at 10:58pm.
It probably helps to sketch the ships.
The distance between the ships is a right triangle with one leg (the east/west leg) being a constant 50km and the other leg being the TOTAL distance traveled by both ships. Express the distance as a function of time then take the derivative with respect to time to find the rate of change of the distance at a given time.
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