Question
Christopher started travelling at 9 a.m. at a speed of 72 km/h towards a town. Julian started travelling towards the town from the same place 3 hours later. When Christopher reached the town at 9 p.m., Julian had another 180 km to travel. What was Julian's average speed?
3 m

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Christopher started travelling at 9 a.m. at a speed of 72 km/h towards a town. Julian started travelling towards the town from the same place 3 hours later. When Christopher reached the town at 9 p.m., Julian had another 180 km to travel. What was Julian's average speed?