64seconds5.39.217.77/ Z8 T9 j! u. j: n: M7 L
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1 to 4 have 3floors = 48 sec公仔箱論壇( S. h$ _3 F5 P% [
avg. 48/3 = 16sec
: g5 j4 Z* Z. A% \' T; C0 c1 X5.39.217.77
v( a2 ^+ C! }. ]/ @4 to 8 have 4floors = 16x4+ f3 f' ], |) J y8 E2 j
= 64secs |