Question
Mia started travelling at 9 a.m. at a speed of 63 km/h towards a town. Sebastian started travelling towards the town from the same place 4 hours later. When Mia reached the town at 5 p.m., Sebastian had another 180 km to travel. What was Sebastian's average speed?
3 m

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Mia started travelling at 9 a.m. at a speed of 63 km/h towards a town. Sebastian started travelling towards the town from the same place 4 hours later. When Mia reached the town at 5 p.m., Sebastian had another 180 km to travel. What was Sebastian's average speed?