Mechanical Properties of Fluids (Bernoulli)

Water flows in a streamline motion through a horizontal pipe of circular cross-section. The pressure difference of water between P and Q is 15 Nm^-2. The areas of cross-section at P and Q are 40 cm^2 and 20 cm^2 respectively. The rate of flow of water through the pipe, in cm^3 s^-1, is: [Take density of water = 1000 kg m^-3]