18.72km/h, my running speed on 4km 12:49

Time equivalence by distance

1km	2km	5km	10km
03:12	06:25	16:01	32:03
15km	20km	Half Marathon	Marathon
48:04	1:04:05	1:07:36	2:15:12

Split by km

km	Time/km
1 km	03:12
2 km	06:25
3 km	09:37
4 km	12:49

Calculate your running speed

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