Time convert into hour

Question

Dear,

I have two Column Start & End both are Datetime data type.

The Data is

Start    End

12:30   15:00

The Total min is 150

i used below query

DATEDIFF(mi, dbo.Trn_Daily3.Dr_TimeStart, dbo.Trn_Daily3.Dr_TimeEnd)

Its giving correct result=150

But when i convert into hour

DATEDIFF(mi, dbo.Trn_Daily3.Dr_TimeStart, dbo.Trn_Daily3.Dr_TimeEnd)/60

then result is 2 but actual 150/60=2.5

How to do it.

Please help on this

Thanks

Basit.