1 litre = 1000 milliliters
3 litres = 3000 milliliters
If you truly intended to write "millimeter", then the question is meaningless.
'Millimeter' is a unit of length or distance, whereas 'liter' is a unit of volume
or capacity. They can't be converted to each other. The question would be
exactly the same as asking "How long is a gallon ?"
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