3'50"/km = 15.65 km/h · 9.73 mph

1 track lap = 1'32"0

At 3'50" per kilometre you run 15.65 km/h, or 9.73 mph (6'10"/mile). 5K in 19'10", 10K in 38'20", half marathon in 1h20'52", marathon in 2h41'45".