64seconds
: a/ M! z5 G. u8 u8 D {, Y: H7 D+ l
1 to 4 have 3floors = 48 sec
5 O4 c' M0 Z; i, c- U5.39.217.76avg. 48/3 = 16sec, ^9 k: [/ X5 _" A& y4 j5 [
- C9 }- L+ E" r( {0 u7 B+ h: h& |1 a公仔箱論壇4 to 8 have 4floors = 16x4tvb now,tvbnow,bttvb, [4 Q( v2 `4 D. w
= 64secs |