請求各位厲害的Cder幫忙解釋OG-12的兩題數學？？

chickenfatty

關於資料充分性：
OG-14題
If Car X followed Car Y across a certain bridge that is12 mile long, how many seconds did it take Car X to
travel across the bridge?
(1) Car X drove onto the bridge exactly 3 secondsafter Car Y drove onto the bridge and drove off the bridge exactly 2 seconds after Car Y droveoff the bridge.
(2) Car Y traveled across the bridge at a constantspeed of 30 miles per hour.

可否各位幫忙解釋第一項原因：
(1) If Car X drove onto the bridge 3 seconds after Car Y and drove off the bridge2 seconds after Car Y, then Car X took1 second less to cross the bridge than Car Y.Since there is no information on how longCar Y took to cross the bridge, there is noway to determine how long Car X took tocross the bridge; NOT suffi cient.
意思是說x上橋時是三秒剛好y下橋是是兩秒～所以x和y剛好差一秒？？
看不是考點～可否幫忙解釋？？？

OG-18題
What is the maximum number of rectangular blocks,each with dimensions 12 centimeters by 6 centimeters
by 4 centimeters, that will fi t inside rectangular Box X ?
(1) When Box X is fi lled with the blocks and restson a certain side, there are 25 blocks in thebottom layer.
(2) The inside dimensions of Box X are60 centimeters by 30 centimeters by20 centimeters.

這題完全不知道考點在哪裡？？
可否解釋一下？？這題答案我選A！！不知錯在哪裡？？

拜託各位了～就當作是復習吧！！謝謝Cder們！！！

michelleqi

14：
题目要求：12/Vx
（1）可知 12/Vx-12/Vy=1   不知Vy，故不充分。
（2）可知Vy=30
故选C

michelleqi

18:
题目要求：盒子X最多能装几个12*6*4规格的盒子？
（1）当X被装满时，最下面一层有25个。     不知一共有几层，不充分。
（2）给出X的规格60*30*20.                        这就能够算出能装几个小盒子啦，虽说我米有算，但是知道它能够算出就足够了！


希望帮到你··

chickenfatty

謝謝了！！非常有幫助！！感謝各位賜教