Which data warehouse architecture uses metadata from existing data warehouses to create a hybrid logical data warehouse comprised of data from the other warehouses?

Answer is federated architecture.

Explanation:

Federated architecture is a part or pattern found in enterprise architecture.

Enterprise architecture can be described as a way or pattern of making sure that proper technology system, that is, a proper IT infrastructure, is adopted by an organization or business in achieving its target or goal.

The aim of enterprise architecture is for an organization to know how to achieve both current and future objectives.

Now, as said earlier, that one of the pattern of enterprise architecture is federated architecture, thus, the federated architecture can be explained as a group of system, which is operating in a standard collective and connected environment.