How much time will the leak take to empty the full cistern

I. 
The cistern is normally filled in 9 hours
 
II. 
It takes one hour more than the usual time to fill the cistern because of la leak in the bottom

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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