Question
Rachel started travelling at 10 a.m. at a speed of 71 km/h towards a town. Zoey started travelling towards the town from the same place 4 hours later. When Rachel reached the town at 6 p.m., Zoey had another 180 km to travel. What was Zoey's average speed?
3 m

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Rachel started travelling at 10 a.m. at a speed of 71 km/h towards a town. Zoey started travelling towards the town from the same place 4 hours later. When Rachel reached the town at 6 p.m., Zoey had another 180 km to travel. What was Zoey's average speed?