The total consolidation settlement for a compressible layer 7 m thick is estimated to be about 30 cm . After about $6 \mathrm{mo}(180 \mathrm{~d})$ a point 2 m below the top of the singly drained layer has a degree of consolidation of $60 \%$. (a) Compute the coefficient of consolidation of the material in $\mathrm{m}^2 / \mathrm{d}$. (b) Compute the settlement for 180 d .