Wouldn't recommend it as things may back up in the drain line. 4" line is the norm ... you want to get rid of waste, not keep it around longer.
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The answer depends on the length AND the cross-section of the pipe. Just one of the two measures is not enough.
Here we have a triangle with angle A 7.5deg and opposite side O 13m, and we're looking to find the hypotenuse H which would be the drain pipe. Remember sin A=O/H, so H=O/sinA. H=13/sin7.5= 99.6m
Everything the same as when only setting up one, however the drain farthest away from where the two meed the drain line must be slightly higher (1/4 inch high per foot of distance to the other drain (or more)and you will have two vent pipes (one from each) that can be tied together and sent out through the roof. Also don't forget you need two traps (one for each right under the drains).
6 ft 1/2 inch
I'm confused by your use of the term, center to center. I'm guessing you mean from the face of the fitting where the pipe threads in. You can usually screw in about 1/2 inch of pipe into a female fitting, so you would need 10 inches to end up with 9 in between. You can screw this together without a union in between? You can only put pipe together in one direction unless you use a union.