How many full bathtubs flow down the Rhine at its mouth every second?

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The answer

19,300 bathtubs

About 19,000 bathtubs. Every single second.

How to get there

1. 2,900 m³/s = 2.9 million litres
2. ÷ 150 litres
3. = about 19,300

Source: Wikipedia: Rhine, average discharge 2,900 m³/s

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