Water falls from a tap of circular cross section at the rate of 2 metres/sec and fills up a hemispherical bowl of inner diameter 0.9 metres. If the inner diameter of the tap is 0.01 metres, then the time needed to fill the bowl is\\
(A) 40.5 minutes\\
(B) 81 minutes\\
(C) 60.75 minutes\\
(D) 20.25 minutes