Question
Liam started travelling at 8 a.m. at a speed of 81 km/h towards a town. Audrey started travelling towards the town from the same place 4 hours later. When Liam reached the town at 8 p.m., Audrey had another 180 km to travel. What was Audrey's average speed?
3 m

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Liam started travelling at 8 a.m. at a speed of 81 km/h towards a town. Audrey started travelling towards the town from the same place 4 hours later. When Liam reached the town at 8 p.m., Audrey had another 180 km to travel. What was Audrey's average speed?