How can I calculate the molar conductivity of a solution with multiple solutes?

I'm running an experiment mixing 2 different solutions, $\pu{5 mL}$ of $\pu{0.1 M}$ $\ce{NaCl}$ with $\pu{5 mL}$ of $\pu{0.1 M}$ $\ce{KCl}$. I am measuring the conductivity of the total solution in $\pu{mS/cm}$, and also measuring concentration of the electrolytes with electrolyte analyzer, so I will get the individual concentrations of $\ce{Na+, K+, Cl-}$ in the mixed solution.


How do I calculate this mixed solution total molar conductivity given these settings? The literature only shows the calculation for a single solution, and I couldn't find any reference on how to calculate this kind of combination.




If you are interested in the modelling of electrical conductivity of aqueous solutions containing more than a single salt, then there are already some references in literature, for example for the salinity of natural waters (*Limnology and Oceanography Methods*, [doi 10.4319/lom.2008.6.489](http://onlinelibrary.wiley.com/doi/10.4319/lom.2008.6.489/abstract)) or in systems relevant to chemical engineering (*Ind. Eng. Chem. Res.*, [doi 10.1021/ie9605903](http://pubs.acs.org/doi/full/10.1021/ie9605903)).


[![enter image description here](https://i.stack.imgur.com/wRZml.png)](https://i.stack.imgur.com/wRZml.png)


(from the latter)


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