Summarized columns value

I have a column timespent_inSeconds. Which is a Text field with a value. I have created a column Minuten (minutes) with the following Query:

Minuten =

VAR TimeSecs = ( IncidentTimeRegistrations[timeSpent_inSeconds] )

VAR TimeMins =

   DIVIDE ( TimeSecs; 60 )

VAR JustSeconds =

   TimeMins - TRUNC ( TimeMins )

VAR JustMinutes =

   TimeMins - JustSeconds

VAR Restminutes = JustMinutes - (IncidentTimeRegistrations[Uren]*60)

RETURN VALUE ( Restminutes )

This is working

I also created a column uren (hours) with the following query

Uren =

VAR TimeSecs = ( IncidentTimeRegistrations[timeSpent_inSeconds] )

VAR TimeHours =

   DIVIDE ( TimeSecs; 3600 )

VAR JustSeconds =

   TimeHours - TRUNC ( TimeHours )

VAR JustHours =

   TimeHours - JustSeconds  

RETURN VALUE ( JustHours )

This is also Working. So far so good.

When I go to my report and summarize the hours and minutes it goes wrong. It indeed summarize all of the values but in the minutes table it says for example 240 minutes. What I want to accomplish is that these 4 hours (240 minutes) will be added to the hour table and removed from the minutes. Everything below 60 minutes should stay in the minutes table.

For example: if I have 257 minutes in the minutes table and 2 in the hours table, it should be 6 hours and 17 minutes.

Does anyone know how to accomplish this?