12.4km/h, my running speed on 15.5km 1:15:00

Time equivalence by distance

1km	2km	5km	10km
04:50	09:41	24:12	48:23
15km	20km	Half Marathon	Marathon
1:12:35	1:36:46	1:42:05	3:24:10

Split by km

km	Time/km
1 km	04:50
2 km	09:41
3 km	14:31
4 km	19:21
5 km	24:12
6 km	29:02
7 km	33:52
8 km	38:43
9 km	43:33
10 km	48:23
11 km	53:14
12 km	58:04
13 km	1:02:54
14 km	1:07:45
15 km	1:12:35
0.5 km	1:15:00

Calculate your running speed

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