Run Track Speed?

I have a run track which is a scrolling background. The coding for the movement of my track is: RunTrack.X-(dt*200*RunTrack.Speed)

I want it to gradually increase in speed so i created a global variable called 'TrackSpeed', and every 2 seconds 5 is added to the variable.

Where in the RunTrack.X-(dt*200*RunTrack.Speed) equation do i integrate the global variable?

Cant you just try to add it different places, and see what it does?

But would guess that it should be: RunTrack.X - (dt * 200 * RunTrack.Speed + TrackSpeed)

I figured it out. You were right it needed to be RunTrack.X-(dt*(200*RunTrack.Speed+TrackSpeed))