20km/h, my running speed on 3km 09:00

Time equivalence by distance

1km	2km	5km	10km
03:00	06:00	15:00	30:00
15km	20km	Half Marathon	Marathon
45:00	1:00:00	1:03:17	2:06:35

Split by km

km	Time/km
1 km	03:00
2 km	06:00
3 km	09:00

Calculate your running speed

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