18.85km/h, my running speed on 6.6km 21:00

Time equivalence by distance

1km	2km	5km	10km
03:11	06:22	15:55	31:49
15km	20km	Half Marathon	Marathon
47:44	1:03:38	1:07:08	2:14:15

Split by km

km	Time/km
1 km	03:11
2 km	06:22
3 km	09:33
4 km	12:44
5 km	15:55
6 km	19:05
0.6 km	20:60

Calculate your running speed

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