Question
Mason started travelling at 5 a.m. at a speed of 72 km/h towards a town. Rachel started travelling towards the town from the same place 3 hours later. When Mason reached the town at 5 p.m., Rachel had another 180 km to travel. What was Rachel's average speed?
3 m

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Mason started travelling at 5 a.m. at a speed of 72 km/h towards a town. Rachel started travelling towards the town from the same place 3 hours later. When Mason reached the town at 5 p.m., Rachel had another 180 km to travel. What was Rachel's average speed?