We know Tim sold tickets with the equation:
[tex]\begin{gathered} t=14h \\ \text{Where t is the number of tickets, h the time in hours and 14 is the rate in tickets/hour} \end{gathered}[/tex]
We need to calculate the rate of sold of Sheri to compare with Tim:
[tex]\begin{gathered} \text{Rate betw}een10AMand12PM\text{=}\frac{28-14}{2}=\frac{14}{2}=7\frac{tickets}{\text{hour}} \\ \text{Rate betw}een12PMand2PM\text{=}\frac{42-28}{2}=\frac{14}{2}=7\frac{tickets}{\text{hour}} \end{gathered}[/tex]
Tim sells tickets at 14 tickets/hour and Sheri at 7 tickets/hour, so answer D is correct.
