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An inverted cone with semi vertical angl...

An inverted cone with semi vertical angle `0=tan^(-1)((1)/(2))` is being filled with water at the rte of `5cm^(3)` min. Then the rate of change of height of water when height of water is `10cm` is

A

`1//15pi`

B

`1//10pi`

C

`2//pi`

D

`1//5pi`

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The correct Answer is:
A
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