Want to make a chart with automated time increments

I need to to start at 3:30 and automatically make the cell under it 3:35 and the 3:40 so on and so on.

So:
3:30
3:35
3:40
3:45

Is there a way to automate this?

In cell C4:

=C3+TIME(0;0;5)

and copy down.

Please look about TIME(hours;minutes;seconds) function in the help.