Water is running into a conical vessel, \( 15 \mathrm{~cm} \) deep ...

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Water is running into a conical vessel, \( 15 \mathrm{~cm} \) deep and \( 5 \mathrm{~cm} \) in radius at the rate of \( 0 \cdot 1 \mathrm{cu} . \mathrm{cm} / \mathrm{s} \). When the water is \( 6 \mathrm{~cm} \) deep, find at what rate is : the wetted surface of the vessel increasing ?
\( \mathrm{P} \)
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