The function pace calculates the pace in minutes per kilometer (metric units) or minutes per mile (imperial units), according to the units of measurement in your basic settings, for example

pace([Time10.Decimal])

If the distance shall not be the length of the contest, it can be added as a second paramter, this will use the unit from your contest settings.

The third parameter is optionally the unit as either:
meters - "m"
kilometers - "km"
miles - "miles"

For example

pace([Time10.Decimal]; 5)

pace([Time10.Decimal]; 5000; "m")

Using the format function the output can be formatted easily:

format(pace([Time10.Decimal]); "m:ss") & " min/mile"