JBMAC's post was as always, awesome!
I think, at the international level, 130+ is fast medium. (kapil dev, botham, zaheer khan, pollock, later day mcgrath). 140+ is fast. (akram - for most of his career except some express fast spells, hadlee, ntini, imran, post stress fracture lillee, garner, ambrose, walsh). and frequently going 150+ is express fast (akhthar, lee, marshall, waqar, bond, holding, donald, thompson).
1) Who was the quickest you faced?
Elango. Back in 1987.
2) How quick do you reckon they were bowling?
I don't know. He hit me in the crotch when I wasn't wearing a box. I am not yet a dad. So I reckon he was really fast.
3) How quick do you reckon you have bowled (be realistic)?
I am an off spinner. At my peak, I would have bowled at about 4km/hour. Sometimes when I didn't like the ball I had bowled I would run after it, catch the ball before it landed on the pitch and come back to my bowling mark.