We can write this in expression form as follows:
[tex]\frac{3}{\frac{4}{4} }[/tex]
Notice that we get a 4/4 in the denominator in which case we multiply the two (because they are both denominators:
[tex]\frac{3}{\frac{4}4} } = \frac{3}{16}[/tex]
So, the unit rate is 3/16 lbs/person.
