A brisk work pace is defined as 3 ft a second.
According to my calculations "brisk" outside walks are:
5 - 25 ft. = 2.77 ft. per second.
26 - 50 ft. = 3.125 ft. per second.
51 - 100 ft. = 3.571 ft. per second.
101 - 200 ft. = 3.846 ft. per second.
Over 200 ft. = 3.86 ft. per second and the farther you walk, the ft. per second increases.
If you use a 2 wheeler, you don't have to walk quite as "briskly", and inside walks are a little less "brisk" than outside walks with or without a 2 wheeler.