VelocityX and VelocityY are allready in units pixels/second.
IF you use the action 'Set stepping mode' to 'Framerate independent'
And if not, and that is the default setting, it using a fixed fake dt to calculate its speeds.
I think that is 1/60.
So then the correction is (Velocity /60) / dt
Normally the relation between 'pixels/tick' and 'pixels/second' is ...
'pixels/tick' = 'pixels/second' * dt