Calculating difference between 2 date time columns

I have two columns in my table column A time report logged and column B time report sent. Both column are of the format.

11/01/2021 09:22:32am 

I want to be able to be able to work our the time take from report created to sent in a 3rd column

See sample date

https://www.dropbox.com/s/pwb1clof20s3q1i/Time_.pbix?dl=0