4'00"/km = 15.00 km/h · 9.32 mph

1 track lap = 1'36"0

At 4'00" per kilometre you run 15.00 km/h, or 9.32 mph (6'26"/mile). 5K in 20'00", 10K in 40'00", half marathon in 1h24'23", marathon in 2h48'47".