how do I change hours and minutes to hours and tenths?

I want to enter a departure time and an arrival time in hours and minutes then have it calculate the elapsed time in hours and tenths.

I can get it to calculate elapsed time in hours and minutes but am having a problem converting it to hours and tenths.

Thank you in advance!

If departure is in A2 and arrival in B2 try

=(B2-A2)*24

format as number

If your times might be on separate days, e.g. 21:00 to 04:30 then chnage to

=MOD(B2-A2,1)*24

Most excellent Daddylonglegs!
That is exactly what I needed and thanks for thinking about going past midnight. Which we do a lot.....
Thanks for your help