let me give it a shot!

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

所有跟帖： 

• Liliac mm 好快啊！不過，題目要求用時 <19分鍾。 -Learntoforget- ♀ (0 bytes) () 01/26/2010 postreply 17:22:14

• 奇怪，小於號沒進去。“題目要求小於19分鍾” -Learntoforget- ♀ (50 bytes) () 01/26/2010 postreply 17:24:52

• 男人完了 -doitthen- ♂ (48 bytes) () 01/26/2010 postreply 17:36:46

• no, they have to cross the bridge with a flashlight. -Learntoforget- ♀ (18 bytes) () 01/26/2010 postreply 17:53:17

• ok try again! -lilac09- ♀ (231 bytes) () 01/26/2010 postreply 17:51:47

• Perfect! You got it! :) -Learntoforget- ♀ (0 bytes) () 01/26/2010 postreply 17:54:57

• 男人完了 -doitthen- ♂ (12 bytes) () 01/26/2010 postreply 17:55:14

• 美壇第一 -doitthen- ♂ (38 bytes) () 01/26/2010 postreply 18:03:17

• 那個大俠，您要讓俺死的快，就直說~~ -lilac09- ♀ (0 bytes) () 01/26/2010 postreply 18:13:39

• 感覺很爽吧 -ryu,- ♂ (0 bytes) () 01/26/2010 postreply 18:25:42

• 嗯，跟您穿著小馬甲蹦達的感覺還差一點點~~ -lilac09- ♀ (0 bytes) () 01/26/2010 postreply 18:28:31

• you are bad -doitthen- ♂ (21 bytes) () 01/26/2010 postreply 18:28:50