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What is dripping out from a conical funn...

What is dripping out from a conical funnel at a uniform rate of `2cm^(3)//sec` through a tiny hole at the vertex at the bottom. When the slant height of the water is 4cm. Find the rate of decrease of slant height of the water given that the vertical angle of the funnel is `120^@`.

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The correct Answer is:
`1/(3pi)` cm/sec
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