Carburettor system in an old engine uses venturi concept to mix the fuel and air. As air

iows downward through a venturi constriction, as shown in Figure $4,$ it creates a low

oressure at A that causes ethyl alcohol to rise in the tube and be drawn into the air

stream. Obtain the velocity of the air as it passes through the tube at B in order to do

this. The air is discharged to the atmosphere at point C$.$ Take pea $=789$ kg$/$m$3$ ano

pair $=1\mathrm{.}225$ kg$/$m$3.$ Assume point A$,$ B and C at about the same elevation.