Question 11
Ellen takes a trip that is y miles long in total, where y > 20. She travels the first 15 miles at an average speed of 30 miles per hour and the rest of the trip at an average speed of 40 miles per hour. Which of the following represents the total time of the trip, in hours?
A. $\frac12+\frac{y-15}{40}$
B. $2+\frac{y-15}{40}$
C. $\frac12+40y-15$
D. $2+40(y-15)$
E. $\frac12+40(y-15)$
A. $\frac12+\frac{y-15}{40}$
B. $2+\frac{y-15}{40}$
C. $\frac12+40y-15$
D. $2+40(y-15)$
E. $\frac12+40(y-15)$