A cup is a measure of volume and a millimeter is a measure of distance. They are totally different. But here's a good question: How many gallons are in a mile?
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A cup is a unit of capacity. A millimetre is a unit of distance. The two units are therefore incompatible.
40 millimetres
Millimetres and millimetres are the same measurement. Therefore, 20 millimetres is equal to 20 millimetres.
Millimetres and millimetres are the same measurement, therefore 5.9 millimetres is equal to 5.9 millimetres.
There are 1000 millimetres in one metre.