10 km/hr 15 km/hr 20 km/hr 25 km/hr
I gave my students this multiple choice question: Tobias rode his bike on a road for a 2 hr period. On average, he passed a 1 km marker every 3 min during this period. Which of the following was his average speed for this 2 hr period?

Only one answer is correct among these 4 choices:
- 10 km/hr
- 15 km/hr
- 20 km/hr
- 25 km/hr

Could you tell me which one is correct?

20 km/hr