18.82km/h, my running speed on 4km 12:45

Time equivalence by distance

1km	2km	5km	10km
03:11	06:23	15:56	31:53
15km	20km	Half Marathon	Marathon
47:49	1:03:45	1:07:15	2:14:30

Split by km

km	Time/km
1 km	03:11
2 km	06:23
3 km	09:34
4 km	12:45

Calculate your running speed

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