Question
Samantha started travelling at 9 a.m. at a speed of 81 km/h towards a town. Lucy started travelling towards the town from the same place 3 hours later. When Samantha reached the town at 7 p.m., Lucy had another 180 km to travel. What was Lucy's average speed?
3 m

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Samantha started travelling at 9 a.m. at a speed of 81 km/h towards a town. Lucy started travelling towards the town from the same place 3 hours later. When Samantha reached the town at 7 p.m., Lucy had another 180 km to travel. What was Lucy's average speed?