The blood that circulates in our body is about 1/12 of our mass. If the kidneys filter 7.5 liter of blood a hour, then how many times does it filter in the kidney the whole blood of a person will mass 60kg?

Here's what my teacher did:

1/12*60=5 liter blood

0.55*5=2.75 liter plasma of blood.

The plasma is filtered 60 times is 24 hours. (how did she find that?)

24 hours ->60 times the plasma filters

1 hour -> x

x=2.5 times

Do you understand her explanation? What should I do next?