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Water runs into an inverted conical tent...

Water runs into an inverted conical tent at 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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