To run a 10k in 50 min, hold 8'03" per mile, i.e. 7.46 mph (5'00"/km). At that pace: 5K in 25'00", 10K in 50'00", half marathon in 1h45'29", marathon in 3h30'59".
10K in 50 min: 8'03"/mile
1 track lap = 2'00"0
1 track lap = 2'00"0
To run a 10k in 50 min, hold 8'03" per mile, i.e. 7.46 mph (5'00"/km). At that pace: 5K in 25'00", 10K in 50'00", half marathon in 1h45'29", marathon in 3h30'59".