Coffee is coming out from a conical filter, with height and diameter both are 15 cm into a cylindrical coffee pot with a diameter 15 cm. The rate at which coffee comes out from the filter into the pot is 100 cu cm/min.
The rate (in cm/min) at which the level in the pot is rising at the instance when the coffee in the pot is 10 cm, is
a. 16π9
b. 9π25
c. 3π5
d. 9π16