Question
Emma started travelling at 10 a.m. at a speed of 90 km/h towards a town. Sofia started travelling towards the town from the same place 2 hours later. When Emma reached the town at 9 p.m., Sofia had another 180 km to travel. What was Sofia's average speed?
3 m

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Emma started travelling at 10 a.m. at a speed of 90 km/h towards a town. Sofia started travelling towards the town from the same place 2 hours later. When Emma reached the town at 9 p.m., Sofia had another 180 km to travel. What was Sofia's average speed?