Position as a function of time. How?

1

I am new to AS and a little confused about the relation between position and time in AS.
If we have this code :
[AS]
onClipEvent(enterFrame) {
speed = 1;
this._x += speed;
}
[/AS]

and a framrate 16 fps, how can we calculate the time it takes to move the MC from position A to position B ?
I mean how can vi control the speed here as a function of time (say as a function av fps) ?

Thanks for helping me with this.

mx-guest2004
=)