Adding Total Hours Worked

I have a field in my sql database for the total weekly time each employee has worked.  I need to add these.  I am adding min and hours seperaterly but is there a better way.  I am using VB in code behind.

For Example.  The below is what my data looks like.  No PM, No date, just total hours..  I should get 19:30.
10:20
9:10