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Mathematics 21 Online
OpenStudy (anonymous):

gravel is being dumped from a conveyor belt at a rate of 25ft^3/min and its coarseness is such that it forms a pile in shape of a cone whose base diameter and height are always equal. How fast is the height of the pile increasing when the pile is 7ft height?

OpenStudy (saifoo.khan):

Did you checked this out? http://answers.yahoo.com/question/index?qid=20081006210807AAOHX78 This is very similar to your problem.

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