A particle of mass 3.28 × {{10}}^{{-27}} kg, moving at 4.02 × {{10}}^{{5}} m/s, strikes an identical particle which is initially at rest. After the interaction, the particles (which can't be distinguished) are observed moving at angles 79.4° and 10.6°, both angles being measured with respect to the original direction of motion. What are the final speeds of the particles?