1.A car driver and a bicyclist start going form the same pla

来源：学生作业帮编辑：作业帮分类：英语作业时间：2024/05/09 14:29:41

1.A car driver and a bicyclist start going form the same place in the same direction a the same time.The car travels 65 km every hour,80 minutes later the driver turns around,and another 20 minutes later he stops to take a break.The bicyclist also turns around after 80 minutes and also takes a break after another 20 minutes.The two rest areas are 50 km apart.How far can the bicyclist go in an hour when riding?
一辆汽车和一辆自行车同时,在同一地点,同向出发.汽车以65公里/小时的速度行驶.80分钟以后汽车调头向回开,又过了20分钟后汽车司机停下来休息.自行车也一样,80分钟以后调头向回开,然后再过20分钟休息.这时他们之间的距离是50公里,问,自行车每小时的行驶速度是多少?
2.Prove that no number in the sequence 11,111,1111,11111,……is the square of an integer.
证明在数列11,111,1111,11111,.中,没有一个是整数的平方
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汽车行驶80分钟后调头行驶20分钟,相当于汽车行驶了60分钟的路程,因为它时速是65.所以休息的时候汽车距离出发点是65公里
因为汽车距离自行车是50公里,也就是说自行车行驶60分钟(1小时)后,走了65-50=15公里
所以自行车每小时的时速是15公里
2题证明题.就免了吧.

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