64seconds
2 J9 {2 w: F$ |% x8 L! m5.39.217.76
3 P$ [; J) ^5 f8 s0 X% D公仔箱論壇1 to 4 have 3floors = 48 sectvb now,tvbnow,bttvb: e; D5 C3 _0 W9 ~! k- Q1 U0 i
avg. 48/3 = 16sec
$ b6 t. H6 p/ w( @$ u1 O$ J3 _5.39.217.765.39.217.76* }1 @* w4 r2 w2 X. Q
4 to 8 have 4floors = 16x4% H9 \' y' x; v5 S7 {* y
= 64secs |