Question
Rebecca started travelling at 7 a.m. at a speed of 60 km/h towards a town. Nora started travelling towards the town from the same place 5 hours later. When Rebecca reached the town at 4 p.m., Nora had another 180 km to travel. What was Nora's average speed?
3 m

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Rebecca started travelling at 7 a.m. at a speed of 60 km/h towards a town. Nora started travelling towards the town from the same place 5 hours later. When Rebecca reached the town at 4 p.m., Nora had another 180 km to travel. What was Nora's average speed?