1)A bicyclist makes a trip that consists of three parts,each

A car driver and a bicyclist start going from the same place at the same direction at the same time.The car travels 65 km every hour,80 minutes later hr stops to take a break after another 20 minutes.The two rest ares are 50 km apart.How far can the bicyclist go in an hour when riding?

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?
2.Prove that no number in the sequence 11,111,1111,11111,……is the square of an integer.
请给出准确译文,

1)A bicyclist makes a trip that consists of three parts,each in the same direction(due north) along a straight road.During the first part,she rides for 22 minutes at an average speed of 7.2 m/s.During the second part,she rides for 36 minutes at an average speed of 5.1 m/s.Finally,during the third part,she rides for 8.0 minutes at an average speed of 13 m/s.
a) how far has the bicyclist traveled during the entire trip?
b)what is her average velocity for the trip?
2)A golfer rides in a golf cart at an average speed of 3.10m/s for 28.0s.She then gets out of the cart and starts walking at an average speed of 1.30m/s.For how long (in seconds) must she walk if her average speed for the entire trip,riding and walking,is 1.80m/s?
3)An automobile starts from rest and accelerates to a final velocity in two stages along a straight road.Each stage occupies the same amount of time.In stage1,the magnitude of the car's acceleration is 3.0m/s^2.The magnitude of the car's velocity at the end of stage2 is 2.5 times greater than it is at the end of stage 1.Find the magnitude of the acceleration in stage 2.
可能令各位眼花了呢.-_-