Calculate the rate at which oil is flowing through a horizontal pipe of diameter 0.93 m, with a smooth constriction to a section of diameter 0.558 m. The density of oil flowing in the pipe is 821 kg/m³. The pressure in the pipe is 9030 N/m² and in the constricted section is 6772.5 N/m². Provide the answer in units of m³/s.