3'10"/km = 18.95 km/h · 11.77 mph

1 track lap = 1'16"0

At 3'10" per kilometre you run 18.95 km/h, or 11.77 mph (5'06"/mile). 5K in 15'50", 10K in 31'40", half marathon in 1h06'49", marathon in 2h13'37".