What is the proper ruff-in for duel bathroom vainty sinks with the sinks about 3 feet apart? One stub out and one trap, with both sinks tied together before the trap like a double bowl kitchen sink. Or, two stub-outs and two traps with two branches tried together and run into the main?
Our State of Wisconsin Plumbing Code permits the first way with a 30″ max. arm from the first sink to the second sinks trap such as on double sink. The second way meets all plumbing codes.
You need to check with your local code officals or consult the plumbing code book governing your area.