The total consolidation settlement for a compressible layer 8.3 m thick is estimated to be about 35

Question:

The total consolidation settlement for a compressible layer 8.3 m thick is estimated to be about 35 cm. After about 8 mo (240 d) a point 2 m below the top of the singly drained layer has a degree of consolidation of 70%.
(a) Compute the coefficient of consolidation of the material in m2/day.
(b) Compute the settlement for 240 d.