12 times
/ t+ w ]- U4 }$ \$ w) B& U公仔箱論壇8 n* ~/ A4 Q$ L/ ?$ l, X! Z/ J8 l0 W" o
each time 4 person but 1 need to back to pick up the other 3公仔箱論壇 Q7 D6 O8 q( f3 g/ f
return x 10 = 30 people公仔箱論壇0 Y2 h" C; s2 R3 G& N
1 time return公仔箱論壇9 W, Q9 w2 Z% @# b( q% I2 y# E
2 person on last time
' g; `* ? C/ T/ J: u; O8 @total : 12 times |