A sludge is added to a column and changes in the sludge$-$water interface over thine are observed. The initial suspended solid concentration is $200m\frac{g}{L}.$ According to the observatione stimmationd below, find zone settling velocity $($Vb$),$ compaction time $($ts$),$ and compactlon height $($ Hs $)$

Table

$[[$ti $($hour$),0,1,2,3,4,6,8,12],$

$[Hi(cm),30,19,10,7,5\mathrm{.}5,4\mathrm{.}5,4,3\mathrm{.}8]]$