In the Petro-chemical industry oil with sp. gr 0.89 enters with an inlet velocity of 0.4 m/sinto a circular pipe of diameter 0.7m. The size of this carrier pipe gradually reduces to 0.5m in diameter along the flow direction. Determine the mean flow velocity of oil at the exit section of the pipe and the mass flow rate of oil. Assume that the temperature of oil remains constant in the process.