Water flow rate in pipes of different diameters

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A pipe contains a gradually tapering section where the diameter decreases from 400 mm to 250 mm. The pipe contains an incompressible fluid of density 1000 kgm^(−3) and runs full. If the flow velocity is 2 ms^(−1) determine:
a) the velocity in the larger diameter
b) the volume flow rate
c) the mass flow rate

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