64seconds
) j' o2 F( M& s" K4 h0 n7 Ntvb now,tvbnow,bttvb公仔箱論壇6 v. u/ W2 r7 B' z2 W- i. j
1 to 4 have 3floors = 48 sec, `, p1 A+ L# a5 M7 g
avg. 48/3 = 16sec
& Z. \8 H- a T& h( ~公仔箱論壇
9 o/ w9 U- K$ Atvb now,tvbnow,bttvb4 to 8 have 4floors = 16x4
* [; ^0 y* C3 Z g4 D. m= 64secs |