Posted by **Mehak** on Saturday, March 12, 2011 at 5:47pm.

a pond that lies in a crater is being drained att he rate of 1000m3/min.If the crater has the shape of an inverted cone of radius 200(at he original water level) and original depth is 50 m (at the center) find that rate at which the water level begins to fall.How fast is it falling when the water at he center is only 20 m deep?

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