Consider Three Galaxies, Alpha, Beta and Gamma $0.70 \mathrm { c }$

Multiple Choice

Consider three galaxies, Alpha, Beta and Gamma. An astronomer in Beta sees each of the other two galaxies moving away from her in opposite directions at $0.70 \mathrm { c }$ . At what speed would an observer in Alpha see the galaxy Beta moving?

A) $0.70 c$
B) $0.82 c$
C) $0.94 c$
D) $0.35 c$
E) $0.57 c$