题干

一列火车长200米,已知它用2小时行驶了144千米,这列火车在这段时间内的平均速度多大?合多少米/秒?若火车仍以此速度通过1.6千米的山洞,则整列火车驶出山洞要花多长时间?(写出具体过程)
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答案(点此获取答案解析)

解:火车的速度v= s1/t1=144km/2

同类题3

 

 Why is setting goals(目标) important? Because goals can help you do and experience everything you want in life. Instead of just letting life happen to you, goals allow you to make your life happen.
 Successful people in life imagine how their life should be and set lots of goals.   ____    It's like having a sign to show you where you

want to go. Think of it in this way. There are two drivers.One has a place to go to clearly in mind which can be found on a map. He can

drive straight there surely without any wasted time. The other driver has no goal , or a map.

____ But she drivers aimlessly(无目的地) around, never getting anywhere, just using up oil. Which driver do you want to be? 
____ They decide what they want in life and then get there by  setting goals and making plans. Unsuccessful people just let life happen by accident. Goals aren't difficult to set, and they aren't difficult to reach.  ____    You are the one who must decide what to achieve and in what direction to aim your life.
 Research tells us that when we write a goal down we are more likely to achieve it.

____   They are harder to forget. Also when you write your goals in your own way, you are able to make yourself realize situations that will bring you nearer to your goals.

根据材料内容,从下面五个选项中选出能填入文中空缺处的最佳选项,使短文意思通顺、内容完整。

A.Written goals can be reviewed usually

B.He starts off at the same time from the same place.

C.It's up to you to find out what your goals really are.

D.By setting goals you are taking control of your life.

E.Winners in life set goals and follow through on them.