date - Summing Hours and Minutes in MySQL query -

After running a query, I am getting the column below in a MySQL

  TimeDiff 03 : 45: 07 03:28:59 00:36:16 00:59:42 02:44:18   
 Now I want to combine the same query together. A sample query is given below  
  Sequel timediff (Outtime, Inetime) as the date range from Table 1   
 I tried the parallel and SEC_TO_TIME But I am using it the wrong way.  
 Please tell me how to get the time to get done 11:53:33   
 
   SELECT SEC_TO_TIME (SUM (tbl.TimeDiff) Pre>  / html>