Question
Michael started travelling at 9 a.m. at a speed of 64 km/h towards a town. Lilian started travelling towards the town from the same place 3 hours later. When Michael reached the town at 6 p.m., Lilian had another 180 km to travel. What was Lilian's average speed?
3 m

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Michael started travelling at 9 a.m. at a speed of 64 km/h towards a town. Lilian started travelling towards the town from the same place 3 hours later. When Michael reached the town at 6 p.m., Lilian had another 180 km to travel. What was Lilian's average speed?