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36. Water tanks

Which of the six water tanks will fill up first?

Gravity and air pressure is the same everywhere,
and the flow rate of the tap is the same as that
of the water flowing out of the openings.

The water initially fills tank 3 up until the level
of the right hand side opening on tank 4.

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What is two times two?

Comments (2)

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MHermsays...

unclear what constitutes "full". Tank 3 will be filled almost to the top when it starts pouring into tank 4

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Purnellsays...

Five fills up first and then six. After that, four, three, two and finally one.

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