15km/h, my running speed on 4.94km 19:45

Time equivalence by distance

1km	2km	5km	10km
03:60	07:60	19:59	39:59
15km	20km	Half Marathon	Marathon
59:58	1:19:58	1:24:21	2:48:42

Split by km

km	Time/km
1 km	03:60
2 km	07:60
3 km	11:60
4 km	15:60
0.94 km	19:45

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