Answer:
They will both have the same acceleration
Step-by-step explanation:
Because its a vacuum, which ordinarily means it will be closed (unless otherwise stated), there will be no opposing forces (like air interference) to each of there acceleration due to gravity - each of them will have an acceleration due to gravity of 9.8 m/s2 (or approximately 10 m/s2) and will hit the "ground" at the same time if "dropped" at the same time.
Here, the masses will not be considered because there are no obstructions/opposing forces.