Dim sTime1 As String
Dim sTime2 As String
Dim sTime3 As String
 
sTime1 = "00:00:00"
sTime2 = "00:01:10"
sTime3 = "00:00:05"
 
MsgBox Format$(CDbl(CDate(sTime1)) + _
  CDbl(CDate(sTime2)) + CDbl(CDate(sTime3)), "hh:nn:ss")

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