Water is flowing through a horizontal tube having cross-sectional areas of its two ends being A and A' such that the ratio A/A' is 5. If the pressure difference of water between the two ends is\[3\times {{10}^{5}}\text{ }N{{m}^{-2}}\], the velocity of water with which it enters the tube will be (neglect gravity effects)

• A. \[5m{{s}^{-1}}\]
• B. \[10m{{s}^{-1}}\]
• C. \[25\,m{{s}^{-1}}\]
• D. \[50\sqrt{10}\,m{{s}^{-1}}\]