The volume flow rate in an artery that supplies blood to the brain is 3.5x10^-6 m3/s. If the cross-sectional area of the artery is 8.5x10^-5 m2, what is the average speed of the blood through this vessel? Find the average blood speed through a narrowed section of the artery where the crosssectional area is reduced by a factor of 3.

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