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**Flow Rate through a pipe!!**

Oil flows along a horizontal pipe which varies uniformly in section from 100 mm diameter at A to 150 mm diameter at B. At A the gauge pressure is 126kN/m2 and at B 140 kN/m2. Find the flow rate in litres per second and kilograms per second. The density of water is 1000kg/m3 and the relative density of the oil is 0.8. could anyone help me find a possible solution to this Q? Thanks.