Water is flowing through a horizontal tube having cross-sectional areas of its two ends being $A$ and $A^{\prime}$ such that the ratio $A/A^{\prime}$ is 5. If the pressure difference of water between the two ends is $3\times10^{5} \mathrm{~N\,m}^{-2}$, the velocity of water with which it enters the tube will be (neglect gravity effects)\\
(1) $5 \mathrm{~m\,s}^{-1}$\\
(2) $10 \mathrm{~m\,s}^{-1}$\\
(3) $25 \mathrm{~m\,s}^{-1}$\\
(4) $50\sqrt{10} \mathrm{~m\,s}^{-1}$