Question
Nathan started travelling at 7 a.m. at a speed of 70 km/h towards a town. Sebastian started travelling towards the town from the same place 4 hours later. When Nathan reached the town at 4 p.m., Sebastian had another 180 km to travel. What was Sebastian's average speed?
3 m

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Nathan started travelling at 7 a.m. at a speed of 70 km/h towards a town. Sebastian started travelling towards the town from the same place 4 hours later. When Nathan reached the town at 4 p.m., Sebastian had another 180 km to travel. What was Sebastian's average speed?