Question
Sebastian started travelling at 6 a.m. at a speed of 73 km/h towards a town. Anna started travelling towards the town from the same place 4 hours later. When Sebastian reached the town at 6 p.m., Anna had another 180 km to travel. What was Anna's average speed?
3 m

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Sebastian started travelling at 6 a.m. at a speed of 73 km/h towards a town. Anna started travelling towards the town from the same place 4 hours later. When Sebastian reached the town at 6 p.m., Anna had another 180 km to travel. What was Anna's average speed?