Orbital velocity at LEO is ~28,000 km/hr, but as you get further away from the Earth, your velocity decreases. Orbital velocity at the distance of the moon is only ~3,700 km/hr. (Obviously this all depends on your reference frame...)

when talking about space travel, speeds and distances aren't relevant the same way they are planetside. in space travel, it's all about who's gravity well you're stuck in, and how much delta V itll take to transfer to a different gravity well.

if we're talking about probes, the delta V aspect becomes a lot more fun when you consider the web of gravity slingshots that can be pulled off to up your dV