[users] converting hh:mm to decimal hours in Calc

[bill]

I collect timesheet information as hh:mm, but to computer pay I need to 
convert it to decimal hours,
e.g: 1:06 -> 1.1

I am sure there is a way to do this, but I just can't figure it.
--
Bill Drescher
william {at} TechServSys {dot} com