To run a half marathon in 2:20, hold 10'41" per mile, i.e. 5.62 mph (6'38"/km). At that pace: 5K in 33'11", 10K in 1h06'22", half marathon in 2h20'00", marathon in 4h40'00".
Half marathon in 2:20: 10'41"/mile
1 track lap = 2'39"3
1 track lap = 2'39"3
To run a half marathon in 2:20, hold 10'41" per mile, i.e. 5.62 mph (6'38"/km). At that pace: 5K in 33'11", 10K in 1h06'22", half marathon in 2h20'00", marathon in 4h40'00".