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Calculate the inlet velocity and mass flow rate of water through the pipe per unit cross-sectional area at inlet.

Relevant Equations: Bernoullis

I've got this so far (if it is correct!):

4 + (20 x 10³)/10³ x g + V²/2g = 15²/2g + h

I'm not sure how to use the area values given to find out the velocity .. I presume I need to use Q = AV?