If the diameter is 1.8m, the circumference can be obtained. The title gives 500 revolutions in 2.5 minutes. Given the circumference of a circle, that is, the length of one week, you can find the length of 500 weeks. Then list the proportional formula, turn 2.5 minutes into seconds and meters into kilometers. Assuming that the distance traveled in x seconds is 92.7 kilometers, calculate [(500 times 1.8)/ 1000]/(2.5 times 60)(92.7/X), and then convert the unit of x into hours.