Chapter 2, Problem 11MCQ

Azra wants to determine the average speed of the high-speed train that operates between Paris and Lyon. Before she boards the train, she measures the length of the train L and the distance d between the electric line poles that are placed along the tracks. Which of the following procedures should she use?

a. Divide the distance between the adjacent poles by 10 time the time needed to pass 10 poles.

b. Divide the length of the train by $\frac{1}{10}$ of the time needed to pass 10 poles.

c. Count how many poles the train passed in 10 s and divide this number by $d\cdot 10$

s.

d. Count how many poles the train passed in 10 s and multiply this number by $\frac{d}{10s}$.