18.88km/h, my running speed on 6.4km 20:20

Time equivalence by distance

1km	2km	5km	10km
03:11	06:21	15:53	31:46
15km	20km	Half Marathon	Marathon
47:39	1:03:32	1:07:02	2:14:03

Split by km

km	Time/km
1 km	03:11
2 km	06:21
3 km	09:32
4 km	12:42
5 km	15:53
6 km	19:04
0.4 km	20:20

Calculate your running speed

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