64seconds
7 D- O6 `0 ?9 G3 y) G1 E# y. Q公仔箱論壇
' D) f U% \, L8 ^3 e8 d7 C) Rtvb now,tvbnow,bttvb1 to 4 have 3floors = 48 sec
+ O/ Q( \- E! [) \+ Uavg. 48/3 = 16sec公仔箱論壇- {/ u0 A3 G; ~3 {( c/ V7 a9 o- q
tvb now,tvbnow,bttvb. s, ~- P3 h* S! _7 m; A
4 to 8 have 4floors = 16x4; g* `% h/ U* ~$ G( p: O
= 64secs |