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A conical vessel of height 10 ft and sem...

A conical vessel of height 10 ft and semivertical angle `30^@` is full of water. It empties in such a way that the height of water in the vessel is decreasing at a constant rate of 1 inch per minute. The rate of which the volume of water in the vessel is decreasing when its height is 6 ft is

A

`pi` c.ft/sec

B

`2pi` c.ft/sec

C

`1//2pi` c.ft/sec

D

`3pi` c.ft/sec

Text Solution

Verified by Experts

The correct Answer is:
A
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