小明准备骑单车从A地到B地旅行，A地与B地的距离是4.5公里。

A地到B地路上除了小明外还有许多的单车一族，他们也骑单车从A地前往B地，假设

他们在从A地到B地的公路上，骑车的速度总是固定的。小明有个特殊的习惯，他总是要和

别人一起骑车，这样才不会孤单。假设小明现在在A地，他会在那等待一个也是到B地旅行

的人，然后就跟上他，和他一起以同样的速度前往B地。如果暂时没有人从A到B，那么小

明会在那等待直到有人从A地到B地时，才会从A地出发，并跟着他，一起前往B地。在旅

途中，如果有个骑车速度比小明快的人从小明身边超过，则小明会立即加速跟上速度更快的

人，并和他一起骑车至B地。

★实验任务：

假设小明到达A地时的时刻是0秒，给你其它旅行者从A点出发时的速度和时刻，请你

计算小明到达B地时的时刻。 -Xiao Ming ready cyclists travel from A to B, A with B to a distance of 4.5 km.

A to B on the road to Xiao Ming, there are many bicycle owners, they are also riding a bicycle to go from A to B, and assume

On the road from A to B, cycling speed is always fixed. Xiao Ming has a special habit, he always

Others to ride with, so as not to be alone. In A and assume that Xiao Ming, he will wait on that one also to B Travel

People, and then just on him, with him to the B to the same rate. If there are no people from A to B, so small

That wait until someone from A to B, will be starting from A to follow him, went to B to In the travel

The way, if there is a cycling speed than small and neat person from tomorrow around for more than, Xiao Ming will immediately accelerate to keep up with faster

And ride with him to B to

To ★ experimental tasks:

Assume small to reach the A and the moment is 0 seconds, the speed and give you other travelers from point A moment, please

Calculation Xiao Ming