In Cocoa, how would I add times for example:

1:30 (one hour and 30 minutes)
1:25 (one hour and 25 minutes)
2:15 (two hour and 15 minutes)

= 5:10

but when I get to greater then 24 hours I do not want it to go, one day x hours and y mins, I want it to continue adding the hours e.g. 25, 26, 27 ... 100 hours etc. Is there already an implemented method in Cocoa?

Thanks