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5, but it also depends on the circumstances. What liquid is used, temperature, viscosity, etc. There’s some material science stuff that’s far beyond the intended scope of this question.
Why 5?
1 fills up halfway, which then overflows in 2. The bottom of 2 has a pipe running out of it, which is directed into 5
I depends on the inflow vs outflow of 1 - it might fill up first. But otherwise, yeah, i would say 5 as well.
