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Math Help - differential equation from related rate of change.

  1. #1
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    differential equation from related rate of change.

    A cylinderical hole is of height H and radius R .. it has a conical portion of same height and radius equal to 1/3rd the height which was removed.. rain is falling at a rate of pi per second... how much time will it take for the hole to be full ?
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  2. #2
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    How do you "remove" a conical portion from a cylindrical hole? Can you draw a picture?
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