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I couldn't quite grasp all of that either, but here are some relationships that might help you along your way.
I am looking for how quickly can the tank be completely drained.
To completely drain the tank, the hole has to be at the lowest point, so how can there be two holes of the same size that take different times?
What exactly are we trying to find here? All I see is desription, no question.
Can anyone help with this one.