Question
Risa started travelling at 8 a.m. at a speed of 80 km/h towards a town. Evelyn started travelling towards the town from the same place 4 hours later. When Risa reached the town at 7 p.m., Evelyn had another 180 km to travel. What was Evelyn's average speed?
3 m

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Risa started travelling at 8 a.m. at a speed of 80 km/h towards a town. Evelyn started travelling towards the town from the same place 4 hours later. When Risa reached the town at 7 p.m., Evelyn had another 180 km to travel. What was Evelyn's average speed?