Two pipelines of equal length and with diameters of 15 cm and 10 cm are in paralle and connect two reservoirs. The difference in water levels in the reservoirs is 3m. if the friction is assumed to be equal, the ratio of the discharge due to the larger diameter pipe to that of the smaller diameter pipe is, nearly,
(a) 3.375 (b) 2.756
(c) 2.25 (d) 1.5