Question
Joseph started travelling at 9 a.m. at a speed of 80 km/h towards a town. Christopher started travelling towards the town from the same place 2 hours later. When Joseph reached the town at 9 p.m., Christopher had another 180 km to travel. What was Christopher's average speed?
3 m

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Joseph started travelling at 9 a.m. at a speed of 80 km/h towards a town. Christopher started travelling towards the town from the same place 2 hours later. When Joseph reached the town at 9 p.m., Christopher had another 180 km to travel. What was Christopher's average speed?