问题 解答题

甲、乙二人分别从A、B两地同时出发,相向而行,甲、乙的速度之比是4:3,二人相遇后继续行进,甲到达B地和乙到达A地后都立即沿原路返回,已知二人第二次相遇的地点距第一次相遇的地点30千米,则A、B两地相距多少千米?

答案

因为,甲乙的速度比为 4:3;总路程是:4+3=7;

第一次相遇时,两人一共行了AB两地的距离,其中甲行了全程的

4
7

相遇地点离A地的距离为AB两地距离的

4
7

第二次相遇时,两人一共行了AB两地距离的3倍,则甲行了全程的:

4
7
×3=
12
7

相遇地点离A地的距离为AB两地距离的:2-

12
7
=
2
7

又因为,两人两次相遇地点之间相距30千米,

所以,AB两地的距离为:

30÷(

4
7
-
2
7
),

=30×

7
2

=105(千米);

答:A、B两地相距105千米.

问答题 案例分析题
阅读理解

(1) Mr. Brown (the motorist)

     At about 9:20 p.m. on October 14th, I was driving along Market Road in the direction of Midwick.

I wanted to go to Sturham to collect my wife, who had been visiting some friends. I prepared to turn into

Sturham Road, which was on my right. In the distance, I saw the lights of a car moving towards me but it was along way from me. I put out my hand to show that I was going to turn right. Then I started to turn

slowly towards Sturham Road. Suddenly there was a loud noise on the passenger's (near) side of the

car. I stopped the car and got out. A motorcycle had hit my car. The motorcyclist had been thrown over

the car. He was injured, so I ran to a shop to phone for help.

(2)  Mt. Smith (the injured motorcyclist)

     On the evening of October 14th, I was going home along Market Road towards Newtown. I was

riding my motorcycle. I was going slowly because some of the streetlights were out and road was wet

and slippery. Just before Sturham road, a car suddenly drove right across my path. The driver did not

flash his lights to give a warning. I could not turn in time, so I hit the side of the car. When I woke up, I

was lying in a hospital in Market Road.

(3) Mr. Lee (another motorcyclist) 

     At about 9:10 p.m. on October 14th, I left my home in Midwick. Ten minutes later I was riding my

motorcycle along Market Road. I was going to Newton. There was a motorcycle about 40 meters in

front of me. It was not going very quickly. The man on it was riding near the curb (路边) but I was near

the center of the road. The motorcyclist in front of me tried to turn to his right but there was no time. He

hit the car and was injured. There was no car going along in front of us o put by the road.

1. Which of these pictures exactly shows the scene of the accident?

X= the place where the motorcycle hit the car;   N=Newtown;M= Midwick;  S=Sturham

(Note that cars and motorcycles always keep to the left in England.)

#

2. Which of these statements about the accident is probably correct?

A. Mr. Brown wrongly supposed that the lights of the two motorcycles were those of a car.

B. the lights of the car moving towards Mr. Brown made him unable to see.

C. Mr. Brown knocked down a motorcyclist on purpose.

D. The accident was caused by the carelessness of the first motorcyclist.

3. It seems probable from the statements that Mr. Brown ______ .

A. gave no signal to show that he was turning right

B. did not five any signal until he was actually turning

C. failed to give a proper signal at that time

D. flashed his light to show that he was going to turn

4. We would expect to find that Mr. Brown's car was damaged on its ______ side.

A. front  

B. left  

C. right  

D. driver's