Marathon in 5:00: 11'27"/mile

1 track lap = 2'50"6

To run a marathon in 5:00, hold 11'27" per mile, i.e. 5.24 mph (7'07"/km). At that pace: 5K in 35'33", 10K in 1h11'06", half marathon in 2h30'00", marathon in 5h00'00".