An inverted cone is 10 cm and diameter and 10 cm is water is called into it at the rate of 4 cm³. find the radius of the water level is 6 cm then it is rising at the rate
A.9/4πcm³/min
B.1/4πcm³/min
C.1/9πcm³/min
D.4/9πcm³/min

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