Fish are processed into fish emal and used as a supplementary protein food. In the processing the oil is first extracted to produce wet fish cake containing $80$wt$\%$ water and $20$wt$\%$ bond$-$dry cake. This wet cake is feed in as dried in rotary$-$drum dryers to give a "dry" fish cake productin containing $40$wt$\%$ water. Finally, the product is finely ground and packed. Dray the digram and calculate the kg$/$h of wet cake feed needed to produce $1000$kg$/$g of "dry" fish cake product.