Mass flow rate of a fluid with non-uniform density

A strange fluid completely fills the pipe of radius r=1 mr = 1\text{ m} through which it flows with speed v=12ln3ms.v = \frac{1}{2-\ln 3} \frac{\text{m}}{\text{s}}. If the density varies radially according to ρ(r)=1000π(1+2r),\rho(r) = \frac{1000}{\pi (1 + 2r)}, what is the mass flow rate in kgs?\frac{\text{kg}}{\text{s}}?

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