[讨论]天山5-35

rengangjhq · 发表于 2005-1-12 22:37:00

Q35:
Station X and station Y are connected by two separate, straight parallel rail lines that are 250 miles long. Train P and train Q simultaneously left station X and station Y, respectively, and each train traveled to the other's point of departure.The two trains passed each other after traveling for 2 hours. When the two train passed, which train was nearer to its destination
   (1)At the time when the two trains passed,train P have averaged a speed of 70 miles per hour.
   (2)Train Q averaged a speed of 55 miles per hour for the entire trip.
   从题面上看似乎70*2=140

的所行距离
55*2=110

的所行距离
                        相加又可以得到全长为250
                        所以可以比较哪个更近:选C
   可是我总觉得题目没有交代是匀速行驶,若是变速行驶,即使在同一平均速度下,相遇的点可以是多个啊?所以想选E.

爱维的天 · 发表于 2005-1-12 22:51:00

已经说相遇时的平均速度是多少，就不用考虑是均速还是变速…

charmant · 发表于 2005-1-12 22:55:00

对。楼上说得对，平均速度70就不用管过程了~相遇的点固定

applepear · 发表于 2005-3-27 18:04:00

Why not D?

xianer2 · 发表于 2005-3-28 11:48:00

why not A? If train P have averaged a speed of 70 miles per hour, thentwo hours later,p travel 70*2=140miles,so,p will be the one morenearer to its destination. please discuss....

fujiannan · 发表于 2005-3-29 10:30:00

I also support "A."

criz · 发表于 2005-3-30 15:53:00

是GWD最新13 套里面的嘛？我的5－35怎么不是这道呀？我是从CD下的呀大家的都是哪里的？怎么回事

channing76 · 发表于 2005-5-4 13:07:00

呵呵，我觉得是D，1）和2）讲得不是一回事吗？

charlesbibi · 发表于 2005-5-4 17:56:00

i think the correct answer is d

nnasa · 发表于 2005-7-12 15:27:00

should be 'E' , (2) avg speed 55miles/hr is for entire trip rather than when they meet.

[讨论]天山5-35

[讨论]天山5-35

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