$A$ water spray gun is attached to a hose of cross-sectional area $30 \text{ cm}^2$. The gun comprises $10$ perforations, each of cross-sectional area $15 \text{ mm}^2$. If the water flows in the hose with a speed of $50 \text{ cm/s}$, calculate the speed at which the water flows out from each perforation. (Neglect any edge effects)

• A
  $100 \text{ m/s}$
• B
  $10 \text{ m/s}$
• C
  $1000 \text{ m/s}$
• D
  $15 \times 10^2 \text{ m/s}$