25.5km/h, my running speed on 8.5km 20:00

Time equivalence by distance

1km	2km	5km	10km
02:21	04:42	11:46	23:32
15km	20km	Half Marathon	Marathon
35:18	47:04	49:38	1:39:17

Split by km

km	Time/km
1 km	02:21
2 km	04:42
3 km	07:04
4 km	09:25
5 km	11:46
6 km	14:07
7 km	16:28
8 km	18:49
0.5 km	19:60

Calculate your running speed

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