To run a marathon in 3:15, hold 7'26" per mile, i.e. 8.07 mph (4'37"/km). At that pace: 5K in 23'06", 10K in 46'13", half marathon in 1h37'30", marathon in 3h15'00".
Marathon in 3:15: 7'26"/mile
1 track lap = 1'50"9
1 track lap = 1'50"9
To run a marathon in 3:15, hold 7'26" per mile, i.e. 8.07 mph (4'37"/km). At that pace: 5K in 23'06", 10K in 46'13", half marathon in 1h37'30", marathon in 3h15'00".