# How to enter compound units?

So I've been using Sagemath for a few days and its an amazing piece of software, the units section is very interesting. However how would I use units like km/h or mph?

How to enter compound units?

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1

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.

Asked: **
2015-09-09 19:47:53 -0600
**

Seen: **91 times**

Last updated: **Sep 10 '15**

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