How fast can you move and still hide?

How fast can you move and still hide?

The travel pace rates on PHB p.182 have “Slow” as 200 feet per minute, and the effect is “Able to use Stealth”. This rate is 20 ft per round.

Yet most characters movement in combat would be approximately 30 ft, so can they still use Stealth if they move more than 20ft in their turn?