How long will Machine Y, working alone, take to produce x candles

I. 
Machine X produces x candles in 5 minutes
 
II. 
Machine X and Machine Y working at the same time produce x candles in 2 minutes

I alone sufficient while II alone not sufficient to answer
 
II alone sufficient while I alone not sufficient to answer
 
Either I or II alone sufficient to answer
 
Both I and II are not sufficient to answer
 
Both I and II are necessary to answer
 

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