1 | initial version |
You can do something like:
sage: a = 3 * units.length.kilometer() / units.time.hour() + 12 * units.length.meter()/units.time.second()
sage: a.convert()
77/6*meter/second
But be careful that the current units system is able to add incompatible units and also forget the unit when some terms cancel, see for example this ask question.