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Sand is pouring at the rate of 12 cm^3/s...

Sand is pouring at the rate of 12 `cm^3`/sec. The falling sand forms a cone on the ground in such away that the height of the cone is always (1/6)th of the radius of the base. How fast is the height of the sand cone increasing, when the height is 4cm?

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CHETANA PUBLICATION-Applications of Derivatives-Exercise
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