According to wiki: (I know, unreliable, but I couldn't get into the IAAF stats page for some reason)
World-class racewalkers (male and female) can average under seven and eight minutes per mile (or under four and five minutes per kilometre, respectively), in a 20 km (12 mi) racewalk
So walking 3 miles in 35 minutes or 2 miles in 20 minutes (with a stroller!) - very impressive! I think those are respectable paces for jogging/running.