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Which One Get Filled First?

I'm revising my answer on the grounds I've got a headache.
I think it could be, either one of them, none of them, all of them, or the hidden number 6. Or it could be that the solution only drips out at 1 drip every 5 minutes meaning that it evaporates before any of them get filled.
 
:22: Tube 3 will fill first out of the tubes.
Bottle 2 will fill first out of the bottles or whatever they are.
 
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