The process below brews a stimulating liquid beverage known colloquially as hot coffee.

The mixer$-$heater dissolves all the solubles.

$($A$)$ Calculate the flow rate of wet solids in stream $5,$ in $k\frac{g}{m}in.$

$($B$)$ Calculate the flow rate and composition of liquid beverage in stream $4,$ in $k\frac{g}{m}in.$

Note: the composition of the liquid beverage in stream $4$ is the same as the liquid portion

of stream $5.$