How would you convert rounds per minute to rounds per second?

If you're looking for the amount of time between one shot and the next, divide 60 by the RPM. For example, an AK-47 has a RPM of 600. You would do: 60 divided by 600. (Which equals 0.1)

If you're looking for how many bullets are fired in one second, then do the other way around: 600 divided by 60.