Oil at 80°F, density r = 56.8 lbm/ft3 and viscosity m = 0.0278lbm/ft.s is flowing steadily in a 0.5in diameter 120ft long pipe. The pressure at the pipe inlet is 120 psi and at the outlet is 14 psi. Determine the flow rate of oil through the pipe assuming that (a) the pipe is horizontal (b) inclined 20° upwards.