height of the outlet.
As a tank drains, the pressure pushing liquid through the opening decreases as the liquid level falls. A lower outlet allows the tank to drain farther before the flow stops.
Why This Puzzle Tricks People
Most people immediately compare the two liquids or assume that identical-looking tanks must empty at the same speed.
That’s exactly what makes the puzzle interesting.
The image is designed to make you overlook a tiny difference while concentrating on the large, obvious details.
Did you choose A or B?
Look carefully
