What is the difference between Welke, Wie, Welk?

Question

Answer

welke - wich 
 wie - wo
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Answer

welk/welke=wich. Wich one of the two you should use, is something you have to feel. 
examples: Met welke auto reed je? (wich car did you drive?)
                In welk huis woonde je? (in wich house did you live?)
In the spoken language, welk/welke, usually, can be replaced by 'wat' of 'wat voor'.
example: Met wat voor auto rijd je? (what car do you drive?)

wie=who