Question $3$:

Water flows through a horizontal pipe that narrows from a diameter of $0\mathrm{.}3$ m at section A to a diameter of $0\mathrm{.}15$ m at section B $.$ The pressure at section A is $250$ kPa $,$ while the pressure at section B is $180$ kPa $.$ Determine the velocities $V_a$ and $V_b$ at sections A and $B.$