Water flows in a horizontal tube (see figure). The pressure of water changes by $$700 \; Nm^{-2}$$ between $$A$$ and $$B$$ where the area of cross section are $$40 \; cm^2$$ and $$20 \; cm^2$$, respectively. Find the rate of flow of water through the tube. (density of water $$= 1000 \; kgm^{-3}$$)

A

$$3020 \; cm^3/s$$

B

$$2720 \; cm^3/s$$

C

$$2420 \; cm^3/s$$

D

$$1810 \; cm^3/s$$