A tortoise and rabbit engage in a footrace over a distance of 3.90 km. The rabbit runs 0.480 km, then stops for a 87.0-min nap. Upon awakening, he remembers the race, and runs twice as fast. Finishing the course in a total time of 1.85 h, the rabbit wins the race.
1. Compute the average speed of the rabbit. Km/h
2. What was his average speed before he stopped for a nap?