a. How far did the train travel during the first two hours?

b. What was the average speed during the first two hours?

c. What was the average speed of the train between the second and the fourth hour?

d. What was the average speed of the train between hour 4 and hour 5?

e. What was the instantaneous speed of the train at hour 7?

f. What was the average speed of the train between the second and the fifth hour?

g. What is the average speed of the train for the entire trip? ​