Angelina drove at an average rate of 80 \mathrm{kph} and then stopped 20 minutes for gas. After the stop, she drove at an average rate of 100 \mathrm{kph}. Altogether she drove 250 \mathrm{~km} in a total trip time of 3 hours including the stop. Which equation could be used to solve for the time t in hours that she drove before her stop?

**Answer Choices**

A. 80 t+100(8 / 3-t)=250

B. 80 t=250

C. 100 t=250

D. 90 t=250

E. 80(8 / 3-t)+100 t=250