I think you're confusing two parts of a jet engine: the fan that pushes bypass air and the turbine that drives it. Rotational speed varies somewhat from model to model, but roughly speaking the N1 fan on a typical airliner engine spins at somewhere between 2,200 and 3,000 RPM. The N2 compressor spool spins in the neighborhood of 10,000 RPM and the turbine spool at ~25,000 RPM. The fundamental difference is that the N1 fan is pushing air -- that is, functioning like a propeller -- while the turbine is being driven by hot gasses.