sql datediff hours and minutes

1Small change like this can be done
2
3  SELECT  EmplID
4        , EmplName
5        , InTime
6        , [TimeOut]
7        , [DateVisited]
8        , CASE WHEN minpart=0 
9        THEN CAST(hourpart as nvarchar(200))+':00' 
10        ELSE CAST((hourpart-1) as nvarchar(200))+':'+ CAST(minpart as nvarchar(200))END as 'total time'
11        FROM 
12        (
13        SELECT   EmplID, EmplName, InTime, [TimeOut], [DateVisited],
14        DATEDIFF(Hour,InTime, [TimeOut]) as hourpart, 
15        DATEDIFF(minute,InTime, [TimeOut])%60 as minpart  
16        from times) source