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April 19, 2015

Homework Help: related rate problem

Posted by george on Friday, December 31, 2010 at 8:08pm.

A railroad track and a road cross at a right angle. An observer stands on the road 70 meters south of the crossing and watches an eastbound train traveling at 60 meters per second. At how many meters per second is the train moving away from the observer 4 seconds after it passes through the intersection?

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