Q&A: Galaxies, Galaxy Clusters, AGN, and Quasars
How long will it take for the M31 galaxy to merge with the M110
and M32 dwarf galaxies? How long will it take for a black hole in M32
to merge with the black hole in M31?
Note that this computer simulation is of 2 spiral galaxies each with a
supermassive black hole in the center. We simply do not know enough
about how galaxies form and evolve and interact to answer your question