In this book, some problems of viscous and viscoelastic fluid through inlined porous plate immersed in a porous medium with Soret-Dufour, heat generation or observation, radiation, chemical reaction, and Hall effect are solved using Crank-Nicolson finite difference method. Results are discussed with the help of graphs and tables. In this book, the two-phase problems with the Soret-Dufour effect are being also solved.