Decimal to HH:MM Conversion - sql-server

Question

I have a table and I want to update the Duration column which of datatype Decimal to HH:MM format.
ECode Duration
101 101.75
101 69.56
102 54.60
103 54.97
The output should be like this:
ECode Duration
101 102.15
101 69.56
102 55
103 55.37
We are calculating the time after the decimal and if after decimal 60 or more then 60 will be there we are adding 1 before decimal and remaining after subtraction from 60 we are showing as it is.
Example 101.75, here after decimal 75 is there so firstly we check it is greater than or equal to 60. If yes then subtract 60 and add 1 before decimal and put the remaining 15 after decimal. So the result should be 102.15.
Please share query if possible to solve this issue.

Answer 1

This should do it:
update thistable
set duration = duration + 0.4
where duration - floor(duration) >= 0.6

Answer 2

update YourTable set
Duration = floor(Duration) +
cast(((Duration - floor(Duration))*100) as int) / 60 +
cast((cast((Duration - floor(Duration)) * 100 as int) % 60) as float) / 100

Answer 3

I guess you would do something like ("pseudo" code of some sort):
String reorder(String x) {
String parts[] = x.split(.);
if(parts.length < 2) x;
// eval as integers:
if(parts[1] < 60) return x;
if(parts[1] > 60) return (parts[0]+(parts[1]/60))+"."+(parts[1]%60);
return parts[0]+1;
}
But exactly how you do it depends whether you're doing in a script, some application and the language you're using...