I used 186,300 mps from a NASA site, but I would defer to MaxQ's figure. If it's got more significant figures it's more impressive*. My handy-dandy conversion to real units site wasn't working (Dang Russkies) so I left it in miles.

Deferring to my figure, rotund as it is, would be extremely unwise, as I am almost omnascient. On the subject of conversion between measurement systems, I have placed an excellent little free conversion app. into my IE favorites folder, so that it is always visible when I'm surfing. The app. is called UnitConverter, and is in AWADabilia for any who want to take a look.

*People are 80% more likely to believe you if you quote numbers and 87.3% more likely if you quote more than two significant figures.
And 42% of all statistics are made up on the spot.