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

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