Hint:

First, define your systems; Overall, Centrifuge and Dryer.

Second, write down all mass balances over your above systems, on solid base and on

water base, then find the useful equations to find unknown values.

a$)$ Find D mass flowrate in $k\frac{g}{m}in?(1$ hour $=60$min

b$)$ Find B mass flowrate in $k\frac{g}{m}in?$

c$)$ Find $C$ and $E$ mass flowrates in $k\frac{g}{m}in?$

d$)$ Find the total pure water removed from this system in $k\frac{g}{m}in?$