A Venturi tube may be used as a fluid flow meter (see Fig. 14.20). If the difference in pressure is P1 ─ P2 = 21.0 kPa, find the fluid flow rate in cubic meters per second, given that the radius of the outlet tube is 1.00 cm, the radius of the inlet tube is 2.00 cm, and the fluid is gasoline (P = 700 kg/m3)