64seconds公仔箱論壇) h! h& l7 z3 C+ S6 S
1 T( ?, }. c& f5 b" v$ Z
1 to 4 have 3floors = 48 sec公仔箱論壇9 E$ t9 T% j, b. L
avg. 48/3 = 16sectvb now,tvbnow,bttvb6 g. d7 f; ]' s* I ]
tvb now,tvbnow,bttvb0 ?5 b- ]' o+ ~* t
4 to 8 have 4floors = 16x4
5 w6 U4 w& |3 C= 64secs |