火车头和车厢（图）

constant · 发表于 2005-11-11 18:19:16

有一个火车头和两节车厢A，B，在如图所示的轨道上。只有火车头能通过隧道，车厢通不过。能不能让两节车厢调换位置，火车头还回到原地？

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constant · 发表于 2005-11-11 23:08:02

Great

! The key is to put A and B together

ob · 发表于 2005-11-11 22:01:45

1. Push B to close to the tunnel.

2. Pull A across the oval track and then push it to the lower track.

3. Push B to the oval track between the two straight rails.

4. Pull A out of the straight rail and push it to behind B and then push them (AB) together to the top side of the oval track.

5. Go to the other side and push BA to the upper straight rail.

6. Pull B back to close to tunnel.

7. Go across the tunnel and then pull A out of the upper rail and push it to B's oringinal position.

8. Pull B to A's oringinal position.

9. Go back to top rail.

野菜花 · 发表于 2005-11-11 21:23:06

火车头可以在后面顶着车厢开吗？

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