A horizontal pipe of diameter 0.746 m has a smooth constriction to a section of diameter 0.4476 m . the density of oil flowing in the pipe is 821 kg/m³ . if the pressure in the pipe is 7820 n/m² and in the constricted section is 5865 n/m² , what is the rate at which oil is flowing? answer in units of m³/s.