Question
Luke started travelling at 11 a.m. at a speed of 60 km/h towards a town. Rachel started travelling towards the town from the same place 3 hours later. When Luke reached the town at 7 p.m., Rachel had another 180 km to travel. What was Rachel's average speed?
3 m

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Luke started travelling at 11 a.m. at a speed of 60 km/h towards a town. Rachel started travelling towards the town from the same place 3 hours later. When Luke reached the town at 7 p.m., Rachel had another 180 km to travel. What was Rachel's average speed?