figuring time and converting to units

I need to add time and convert it to units. An example is

If someone works from 7:15 to 11:30 I need the total to read 4.25 and it reads 4.15,

We have clients that work for us and we bill another agency based on whole and quarter hours (.25, .50, .75) I have tried everything I can think of and cannot figure out a formula. When I think I have it, it comes up in time

Thanks in advance

If J3 contains the time version, 4:15:

=HOUR(J3)+MINUTE(J3)/60
and make sure this cell is formatted as number, not time

If you want the calculation to be done at the same time, replace J3 in the formula to whatever cells you're calculating from, such as:

=HOUR(J3-J1)+MINUTE(J3-J1)/60

This is what I get when I put that formula in

Time In 7:30
Time Out 10:45
Service Units 6:00

I need the formula to read 3.25 for the amount of hours worked

I needed to format the cells differently

Thank you thank you!!!!