How do I get the speed (RPM) from the Encoder VI

Greetings,

I have a two motors with quadrature encoders attached to them.

I am using the Encoder VI with the myRIO, which outputs two values - Counter value and Counter direction. From the counter value I am trying to display the speed (RPM). All the counter value does is is count up or down depending on the direction; I need a way to use these counts to measure the speed. I can't figure out how to do this?

Thank you in advance for your help.