Respuesta :

Answer:

[tex]{7.5 \: mm(h)}^{ - 1}[/tex]

Step-by-step explanation:

[tex] a \: unit \: rate \: for \: the \: situations \: is \: given \: by :

\\ rate = \frac{30 milliliters }{ 4 hours} = 7.5\frac{mm}{h} = {7.5 \: mm(h)}^{ - 1} [/tex]