Dynamic light scattering (DLS) and small-angle neutron scattering (SANS) are used to characterize the structure and dynamics of ternary solutions consisting either of rods or "hairy rod" polymers and polystyrene (PS) coils in a solvent composed of chloroform saturated with (<0.5%) formamide (CF). The rods are poly(-benzyl-alpha -L-glutamate) (PBLG), and the hairy rods are two forms of poly(gamma -ctadecyl-alpha -L-glutamate)-co-(gamma -methyl-alpha -L-glutamate) with varying amounts of octadecyl substitution. The DLS autocorrelation functions reveal the existence of two relaxation modes that are interpreted in terms of the random phase approximation theory (RPA) as the cooperative and interdiffusive modes. The two relaxation modes are investigated as a function of the total polymer concentration C-P and the relative composition x = C-rod/C-P as well as the percentage of octadecyl groups along the polyglutamate chain. The different diffusion coefficients that characterize the dynamics in these systems are well described by the RPA theory of polymer mixtures. In addition, the interaction parameter chi extracted from both the DLS and SANS experiments is found to be negative. These results suggest an attraction between PS and PBLG molecules and that these polymers are therefore compatible. The hairy rod ternary solution diffusion coefficients indicate that as the percentage of hairs on the rod increases, the polymers become more compatible.