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Water runs into an inverted conical tent...

Water runs into an inverted conical tent at the rate of `20 ft^3`/ min and leaks out at the rate of `5 ft^3`/min .The height of the water is three times the radius of the water's surface. The radius of the water surface is increasing when the radius is 5 ft, is

A

`(1)/(5pi)` ft/mi

B

`(1)/(10pi)` ft/min

C

`(1)/(15pi)` ft/min

D

None of these

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The correct Answer is:
A
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