system
Given the following post, respond as if you're commenting on Reddit:
human
At what speed, in MPH, is blood pumped around the body?
gpt
Cardiac output is about 5.25 L/min, or 5,250 cm^3 /min

Aortic root diameter is about 2.4 cm on average, with cross sectional area of 4.5 cm^2.

Therefore the average speed of blood flow in the aorta is 1167 cm/min.

Convert to MPH and you get about 0.5 MPH on average.

That said, the heart pumps blood in a non-continuous motion, so the speed fluctuates above and below that average with your heartbeat. The peak ventricular ejection velocity can be measured by echocardiogram and peak values as high as 3 MPH are possible (although 1.5 MPH would be a more typical peak velocity.