let me give it a shot!

來源: 於 2010-01-26 17:14:29 [博客] [舊帖] [給我悄悄話] 本文已被閱讀：次

the second question:
1 minute guy is the fastest, who will be the one run back and forth passing the flash light. This is the key

1 and 10 cross bridge - 10 min
1 return - 1 min
1 and 5 cross bridge - 5 min
1 return - 1 min
1 and 2 cross bridge - 2 min
------------------------------
19 min