Question
Elizabeth started travelling at 10 a.m. at a speed of 70 km/h towards a town. Alexander started travelling towards the town from the same place 3 hours later. When Elizabeth reached the town at 7 p.m., Alexander had another 180 km to travel. What was Alexander's average speed?
3 m

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Elizabeth started travelling at 10 a.m. at a speed of 70 km/h towards a town. Alexander started travelling towards the town from the same place 3 hours later. When Elizabeth reached the town at 7 p.m., Alexander had another 180 km to travel. What was Alexander's average speed?