Q: In one day, a family in a car rode for 2 hours, stopped for 3 hours, and then rode for another 5 hours. During the day, the family traveled a total distance of 400 kilometers. What was their average speed for the whole trip?
What is the correct answer to this question?
OPTIONS:
- 10 km/h
- 20 km/h
- 40 km/h
- 50 km/h
40 km/h