64seconds
9 J H) X/ f& G. h( `1 L5.39.217.760 i0 E* ?$ f9 s4 Q
1 to 4 have 3floors = 48 sectvb now,tvbnow,bttvb" D+ P1 _& @5 R' z& j
avg. 48/3 = 16sectvb now,tvbnow,bttvb# ]" Q, _4 D1 i/ `* x
2 C! A% D. O4 a
4 to 8 have 4floors = 16x4公仔箱論壇2 U' Y2 e, x5 Y- b2 b% \7 `# Z" C
= 64secs |