Hello

To convert hours and minutes from a decimal number to the hh:mm:ss format,
use the following formula: 

11.50 hours
=Hours.Minutes/24 
=11.5/24
Use this formula to convert 11.50 minutes to 0:11:30:
=11.50/1440
Use this formula to convert 11.5 hours to 011:30:00:

=11.5/24
HTH