64seconds
; k0 p6 R3 A/ T! y" W! I公仔箱論壇
3 K) w9 _% r8 W1 to 4 have 3floors = 48 sec7 l' ]& @' J4 E v+ o
avg. 48/3 = 16sectvb now,tvbnow,bttvb; w4 {, V2 D0 J h
; \2 Q. x" w/ R9 Ntvb now,tvbnow,bttvb4 to 8 have 4floors = 16x4
g5 @+ n; e5 }$ K4 f= 64secs |