64seconds" h: q2 e' L: g- C; T
. m5 W2 g. ?3 l8 T. a公仔箱論壇1 to 4 have 3floors = 48 sec公仔箱論壇' G0 `, h. o% M; {3 A0 I" @* L
avg. 48/3 = 16sec
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4 to 8 have 4floors = 16x4
6 \" ?9 D/ ]" U1 [/ l2 g公仔箱論壇= 64secs |