数学DATA类题目，紧急求助

alicejingli · 发表于 2010-8-21 10:57:28

14. If Car X followed Car Y across a certain bridge that is 12 mile long, how many seconds did it take Car X to travel across the bridge?
(1) Car X drove onto the bridge exactly 3 seconds after Car Y drove onto the bridge and drove off
the bridge exactly 2 seconds after Car Y drove off the bridge.
(2) Car Y traveled across the bridge at a constant speed of 30 miles per hour. Arithmetic Rate problem
Find the number of seconds that it took Car X to cross the 12 -mile bridge.
(1) If Car X drove onto the bridge 3 seconds
after Car Y and drove off the bridge
2 seconds after Car Y, then Car X took
1 second less to cross the bridge than Car Y.
Since there is no information on how long
Car Y took to cross the bridge, there is no
way to determine how long Car X took to
cross the bridge; NOT suffi cient.
(2) If the speed of Car Y was 30 miles per hour,
it took Car Y
不明白这道题，drive on 的含义是从上桥开始计算吗？能这样想吗？t+3=60+2 t=59 这句话是什-意思？

alicejingli · 发表于 2010-8-25 22:43:48

急求，有人能翻译加解答吗？谢谢

数学DATA类题目，紧急求助

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