solution:公仔箱論壇# T9 q' w0 s+ R. |( |
% s' `1 x/ j2 [2 Z% m
1st and 2nd lady go over: 2 mins taken
; U9 | ^, O: w8 T' b, W' mtvb now,tvbnow,bttvb1st lady walk back: 1 mins taken
u8 K/ M' S& ], Gtvb now,tvbnow,bttvb3rd and 4th lady go over: 10 mins taken5.39.217.77:8898- o+ `, `4 c) t) n8 z
2nd lady walk back: 2 mins taken- X j% ] A. r/ A, k7 j: |
1st and 2nd lady walk back: 2 mins taken5.39.217.77:8898* _7 X2 X# Q- `/ l5 j& t2 r
$ Q2 c/ i9 \& C) T5 Q EIn total : 17 mins taken!!! Solved!! |