To run a half marathon in 1:10, hold 5'20" per mile, i.e. 11.24 mph (3'19"/km). At that pace: 5K in 16'35", 10K in 33'11", half marathon in 1h10'00", marathon in 2h20'00".
Half marathon in 1:10: 5'20"/mile
1 track lap = 1'19"6
1 track lap = 1'19"6
To run a half marathon in 1:10, hold 5'20" per mile, i.e. 11.24 mph (3'19"/km). At that pace: 5K in 16'35", 10K in 33'11", half marathon in 1h10'00", marathon in 2h20'00".