12.79km/h, my running speed on 21km 1:38:28

Time equivalence by distance

1km	2km	5km	10km
04:41	09:23	23:27	46:53
15km	20km	Half Marathon	Marathon
1:10:20	1:33:47	1:38:55	3:17:51

Split by km

km	Time/km
1 km	04:41
2 km	09:23
3 km	14:04
4 km	18:45
5 km	23:27
6 km	28:08
7 km	32:49
8 km	37:31
9 km	42:12
10 km	46:53
11 km	51:35
12 km	56:16
13 km	1:00:57
14 km	1:05:39
15 km	1:10:20
16 km	1:15:01
17 km	1:19:43
18 km	1:24:24
19 km	1:29:05
20 km	1:33:47
21 km	1:38:28

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