Just had a look at my Rolls Royce book and the only speed it gives is for a centrifugal compressor type which it says can spin at up to 1600 feet per second.
Alternatively, if you consider that the fan tips of the 211 are nominally operating at or close to the speed of sound, (hence that orrible grinding noise at take off power), then estimate the radius of the fan and with a bit of pye R squared bob's your aunties live in lover!
My maths is a bit rusty at this time of night especially after a couple of Taliskers!!!! So I'll let you work it out.