walking speed

[manofsteel]

As a 6 footer with a 2' 9" stride what speed am I likely to achieve and maintain walking briskly for 30 mins say ?

[Quoi]

How accurate do you need to be? Brisk walking would give an average man a speed between 3.5 - 4 miles per hour. So roughly between 1.75 and 2 miles in 30 mins.