64seconds
) q' Q n5 [0 V9 L! {
5 L5 q7 l$ M' B8 Htvb now,tvbnow,bttvb1 to 4 have 3floors = 48 sec
# u# H0 }+ I7 N, q% \2 K. Q5 H6 ftvb now,tvbnow,bttvbavg. 48/3 = 16sec
% f5 }+ m0 y4 ~0 ?8 i公仔箱論壇* k# L. T4 i" d$ E0 f K
4 to 8 have 4floors = 16x4
# s5 x( b. h- R* D" U O0 p= 64secs |