Answer :
Let:
r1 = unit rate of pints per hour for the farm worker in the morning
r2 = unit rate of pints per hour for the farm worker in the afternoon
For r1:
She packed 3 pints of strawberries every 4 minutes, so:
[tex]\begin{gathered} r1=\frac{3_{\text{ }}pints}{4_{\text{ }}minutes} \\ r1=\frac{3}{4}\frac{_{\text{ }}pints}{\min } \\ r1=0.75\frac{_{\text{ }}pints}{\min} \end{gathered}[/tex]For r2:
she packed 2 pints of strawberries every 3 minutes, so:
[tex]\begin{gathered} r2=\frac{2_{\text{ }}pints}{3_{\text{ }}minutes} \\ r2=\frac{2}{3}\frac{pints}{\min } \\ r2=0.67\frac{pints}{\min } \end{gathered}[/tex]the difference between her morning and afternoon packing rates is:
[tex]\begin{gathered} Dr=r1-r2 \\ Dr=\frac{3}{4}-\frac{2}{3} \\ Dr=\frac{1}{12}=0.0833 \end{gathered}[/tex]