What is the maximum ampacity for each of two 12-AWG THHN con…

What is the maximum ampacity for each of two 12-AWG THHN conductors that are in a raceway with four other 10-AWG THW conductors? The conduit also contains two 12-AWG grounding conductors for a total of eight conductors in the raceway. The circuits supply motors and the terminals are 75 degree C.