4 km/h 40 km/h 70 km/h 280 km/h
I gave my students this multiple choice question: A bus traveled 280 kilometers between two cities. It left the first city at 3:00 p.m. and arrived at the second city at 7:00 p.m. What was the average speed of the bus during the trip?

Only one answer is correct among these 4 choices:
- 4 km/h
- 40 km/h
- 70 km/h
- 280 km/h

Could you tell me which one is correct?

70 km/h