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