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The diameter of a blood vessel narrows by 70% due to the presence of a plaque...

The diameter of a blood vessel narrows by 70% due to the
presence of a plaque on the blood vessel walls.
(a) By what factor does the blood velocity increase?
(b) If the blood velocity in a normal blood vessel is 0.15 m s-1
and the systolic blood pressure is 130 mmHg, what is the systolic blood pressure in the narrowed vein (in mmHg)?

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