said by Meh37 :

Actually, it's the reverse. An LP spins with a constant angular velocity (RPM remains a constant 33 1/3), so the outer edge moves faster than that near the center. The linear velocity decreases as the needle moves from the edge to the center.

said by MrMoody :

Right, and a good example of why Wikipedia is not an authority.

33-1/3 was chosen originally to make 1 inch of grooves at 100 grooves per inch (the effective pitch of the screw driving the recording needle times the gearing) take exactly 3 minutes. At exactly 1.8 seconds per revolution, it's also exactly 108 cycles per revolution at 60 Hz and 90 cycles per revolution at 50 Hz which may have had something to do with the choice as well. It was designed in the 1920s for film soundtracks, and the exact power frequency multiple might have made it easier to adjust the speed in both Europe and the States.