The first one is easy: in Cormorant’s own frame of reference, his own velocity is, of course, zero.
For Shag’s velocity we need the velocity transformation formula. In Nefertiti's frame of reference, Shag’s velocity, as he approaches her from the left, is wN = 0.6c. Meanwhile, u is the velocity of Cormorant’s frame of reference relative to Cormorant’s, which is -0.6c (as Cormorant, and his frame of reference, are moving in the opposite x-direction towards Nefertiti). So:
