64seconds
0 A X+ F' a* C" H* N7 _9 K, B) j9 r5 u) {. |
1 to 4 have 3floors = 48 sec, z- C% n5 d' \
avg. 48/3 = 16sec
2 `% u8 d4 A& Y2 O" P. ?tvb now,tvbnow,bttvb
0 H# b9 ?7 X2 G/ O6 l+ ^6 J& z3 ]: ?公仔箱論壇4 to 8 have 4floors = 16x4
. L1 y% k: |3 f0 s2 i: a' W% n* X= 64secs |