Question
Matthew started travelling at 8 a.m. at a speed of 60 km/h towards a town. Oliver started travelling towards the town from the same place 3 hours later. When Matthew reached the town at 4 p.m., Oliver had another 180 km to travel. What was Oliver's average speed?
3 m

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Matthew started travelling at 8 a.m. at a speed of 60 km/h towards a town. Oliver started travelling towards the town from the same place 3 hours later. When Matthew reached the town at 4 p.m., Oliver had another 180 km to travel. What was Oliver's average speed?