64seconds
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1 to 4 have 3floors = 48 sec: j/ m8 P/ ?% }+ {& Z! |+ `
avg. 48/3 = 16sectvb now,tvbnow,bttvb. x, `" Q. ^8 U% u* O6 d9 O. b
0 S O. Z( U4 w' h T* otvb now,tvbnow,bttvb4 to 8 have 4floors = 16x4
1 W" N2 C6 M; q; r( ]9 d- w= 64secs |