15km/h, my running speed on 2km 08:00

Time equivalence by distance

1km	2km	5km	10km
04:00	08:00	20:00	40:00
15km	20km	Half Marathon	Marathon
1:00:00	1:20:00	1:24:23	2:48:47

Split by km

km	Time/km
1 km	04:00
2 km	08:00

Calculate your running speed

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