How do you solve this?

Question

A person breathes in about mc004-1.jpg cubic meters of air per second. How long does it take to breathe in 2.5 cubic meters of air?

Answer 1

r = cubic meters of air per second (which you did not clearly state)

 

V = amount breathed = 2.5 cubic meters

 

t = time = V/r

 

You know V in cubic meters, find r in cubic meters per second, plug in the numbers, and get t in seconds.