Question : Sports timing 00:00:00:00 and sql data types

I need to store seconds and hundreths in mssql.
This is to record sports times.
I tried inputting based on my best guess 00:00:23:09 being 23 seconds and 09 hundreths of a second but obviously this doesnt work.
How should I go about doing this as I need to have time so I can rank the results.

Answer : Sports timing 00:00:00:00 and sql data types

assuming your 2 variables are of type varchar so that the .09 is stored as '09' in the @RoundTimeH variable then
convert(datetime,'00:00:'+@RoundTimeS+'.'+@RoundTimeH,14)
should work, the & is a boolean operator in SQL.