Air is blown through a circular and horizontal Venturi tube. The diameter of the narrow section is b= 0.9cm , and it is a= 4cm for the wider section. The height difference, h, of the mercury columns is measured to be 2.3mm. What are the air speeds in the (a) wider and the (b) narrower sections of the tube? 

The density of mercury is 13600kg/m^3. Assume the density of air is 1.3kg/m^3.