WolframAlpha is really great at such things: http://www.wolframalpha.com/input/?i=2+cm%2Fc+in+ps

Exactly. And besides:

This is CERN we're talking about here! If even they don't know what they are doing, then nobody else will...

Within 20cm:
"The distance between the origin of the neutrino beam and OPERA was measured with an uncertainty of 20 cm over the 730 km travel path."
from CERN's press release