A runner completes a track in three segments. For the first 'v - 5' km, he runs at 15 km/h, for 'v' km at 25 km/h, and the last 'v + 5' km at 20 km/h. If his average speed is 20 km/h, determine 'v'.
ATQ, Given = 
On solving we get, v = 15
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