it depends on the rate of flow into it, like if the faucet dumps out water way faster than it travels through the connecting tube then it would fill up before any of the others
if that's the case then it'd 100% be 5, 4 has a hole in it, 7 wouldn't fill until 3 did so even if it's volumetrically equivalent to 5 it wouldn't fill up
it depends on the rate of flow into it, like if the faucet dumps out water way faster than it travels through the connecting tube then it would fill up before any of the others
if it's a slow drip it'd be 5
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if that's the case then it'd 100% be 5, 4 has a hole in it, 7 wouldn't fill until 3 did so even if it's volumetrically equivalent to 5 it wouldn't fill up