MDX Tuple to Convert Seconds to hh:mm:ss

vba!Format(vba!fix([Measures].[Avg Usage by Active Users] / 3600) ,"00") + ":" +  vba!Format((vba!fix([Measures].[Avg Usage by Active Users] / 60) - (vba!fix([Measures].[Avg Usage by Active Users] / 3600) * 60) ) ,"00") + ":" +  vba!Format([Measures].[Avg Usage by Active Users] - (vba!fix([Measures].[Avg Usage by Active Users] / 60) * 60) ,"00")