有一商人从B城到K城去贩货,请了一名向导。由于没有车子可乘,只好骑着骡子去K城。向导在前面牵着骡子的缰绳,一步三摇地走着。商人问向导能否改变速度时,向导说:“能改变的,只是速度会更慢。”商人看了地图,建议到路过的P城去吃些点心。向导立即牵着缰绳往P城方向走去。不知走了多少时间,商人问向导:“已经走了多少路了?”向导说:“正好是从这 A businessman from B City to K City to the goods, please a guide. Because there is no car ride, had to ride a mule to K City. Wizard in front of the mule holding the reins, walked slowly. When the businessman asked whether the wizard can change the speed, the wizard said: ”It can be changed, but the speed will be slower.“ The businessman looked at the map and recommended to eat pastry in the passing city. The wizard immediately took the reins to P City walked in the direction. I do not know how much time to go, the businessman asked the wizard: ”How many roads have gone?“ The wizard said: ”Just from here