Question
Alexander started travelling at 5 a.m. at a speed of 80 km/h towards a town. Joshua started travelling towards the town from the same place 4 hours later. When Alexander reached the town at 4 p.m., Joshua had another 180 km to travel. What was Joshua's average speed?
3 m

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Alexander started travelling at 5 a.m. at a speed of 80 km/h towards a town. Joshua started travelling towards the town from the same place 4 hours later. When Alexander reached the town at 4 p.m., Joshua had another 180 km to travel. What was Joshua's average speed?