Question
Sophia started travelling at 10 a.m. at a speed of 78 km/h towards a town. Nathan started travelling towards the town from the same place 4 hours later. When Sophia reached the town at 8 p.m., Nathan had another 180 km to travel. What was Nathan's average speed?
3 m

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Sophia started travelling at 10 a.m. at a speed of 78 km/h towards a town. Nathan started travelling towards the town from the same place 4 hours later. When Sophia reached the town at 8 p.m., Nathan had another 180 km to travel. What was Nathan's average speed?