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Water is running into a conical vessel, 15 cm deep and 5 cm in radius, at the rate of 0.1 . When the water is 6 cm deep, find at what rate is the wetted surface of the vessel increasing?

A

`1/(10pi) cm//sec`

B

`1/(20pi) cm//sec`

C

`1/(30pi) cm//sec`

D

None of these

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The correct Answer is:
D
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