To measure in cubic metres, the units used must be metres.
So if one of the measurements is 200 cm, use 0.2 metres in the calculation.
If you don't do this then you will need to convert the cubic (?) result into cubic metres.
For example, 1,000 cubic centimetres = 1 cubic metre.
1,000,000 cublic millimetres = 1 cubic metre.
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You can't since they measure different properties. You cannot express a length in units of volume. It's like asking "what is the height of the Statue of Liberty in cubic meters?".
multiply them
You can't convert that. One is a unit of length, the other, of area. You can convert meters to centimeters, square meters to square centimeters, or cubic meters to cubic centimeters.
You cannot convert cubic meters per second to meters per second. You cannot convert volume to length.
You can't convert a unit of volume to a unit of length.