Which One Will Be Full First?

Answer of the puzzle “Which One Will Be Full First?” is box 3 and 4
Both 3 and 4 will be full together. This is probably because they both are on same level.
Water (any liquid) will flow down to lowest level (see level) and will be filled first.
Since 3 and 4 are at same level and their height is also same, both will be full first than any other box.

If you have any better explanation or answer, please share in the comment section.

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