64seconds
h! w- D$ S1 K( o |) n
8 f0 j& p* c& L+ f8 `" Stvb now,tvbnow,bttvb1 to 4 have 3floors = 48 sec) E" P- o. W& q( e& v$ i8 r" C6 N
avg. 48/3 = 16sec9 Y1 W, t- r' n
2 b0 z$ R/ {6 _# H' u' @tvb now,tvbnow,bttvb4 to 8 have 4floors = 16x4
. V: ]( Z- w( p) z% m s5 C5.39.217.76= 64secs |