Database refresh from db A to db B and changing the name from B to A

We have two databases A and B, both running on HP-UX environment on different servers. both of 10.2.0.1.0 version.
Now, database A is production with 75.5 GB of data. database B is just skeloton with no user tablespaces.
1.Our requirement is to refresh / clone database A to B. we are fine in recreating the database B like in case of cloning. but we want to avoid recreating database B as much possible.
2. After refresh/clone, database B should be renamed_ to database A.
Can you all please suggest the different methods available both by shutting down / without shutdown of database A and the approximate time taken on each cases.

Thanks Sanjay for your suggestion.
As per your case, we need to shutdown database A and delete the database B. We are trying to avoid this case as much as possible.
We are thinking of options like
export/import using datapump,
transportable tablespaces
restoring and recovering from backups
In the above scenarios, we no need to delete the database B and no need to shutdown database A.
Also, I need the approx time for each process and the method to rename the database?

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