How to show exact time when convert numeric value

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SQL-Server

SELECT TOP (200) Emp_ID, ProxyNo, EmpName, JoiningDate, Dept_Name, Designation, Emp_Type, Atten_date, OriginIntime, EIntime, EOutTime, Status, Shift, Overtime, OutTimeCal, TotOT, RealOT, EOT, MorOT, 
TimeDedu, SDate, EDate, PDay, AbDay, CLDay, ELDay, SLDay, WDay, FDay, WorkHrs, Pstatus, Section, Unit_Name, SubSection, ComID
FROM   Temp_JobCard
WHERE        (RealOT = 1.50)

Here I want to show 1.5 = 01:30 that means, if the result is 1.5 it will show me 01:30 .Same as 1.25= 01:15. Basically i need to show time,hour to convert this numeric number.

What I have tried:

SELECT CONVERT(datetime,REPLACE('1.5','.',':')) 

My output is

1900-01-01 01:05:00.000

But its not correct.

But I need output is

01:30<pre>