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35. Water tanks

Which of the four 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 opening on tank 4.

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Purnellsays...

The water level in tank 4 will start rising until it becomes level with tank 3. Therefore, tank 3 and 4 will fill up at the same time.

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jmsays...

the correct answer should be only 3- you would need water pressure from tank 3 being full to start filling tank 4.

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