I don't think it will be easy if you format h:min:secs.
If it's important and you want a simple arithmetic way to do it here goes
Head 3 columns Hours Minutes Seconds
Enter your 2 19 41 in these
Leave a column blank
Assume 2 is in A1 then A1*60 Column 5
Assume 19 is in B1 then =B1 Column 6
Assume 41 is in C1 then =C1/60 Column 7
Column 8 would be =addition of Column 5 6 7
(Aged 78 - but it does work!