Question
Christopher started travelling at 9 a.m. at a speed of 75 km/h towards a town. Oliver started travelling towards the town from the same place 4 hours later. When Christopher reached the town at 7 p.m., Oliver had another 180 km to travel. What was Oliver's average speed?
3 m

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Christopher started travelling at 9 a.m. at a speed of 75 km/h towards a town. Oliver started travelling towards the town from the same place 4 hours later. When Christopher reached the town at 7 p.m., Oliver had another 180 km to travel. What was Oliver's average speed?