Question
Oliver started travelling at 10 a.m. at a speed of 60 km/h towards a town. Lucas started travelling towards the town from the same place 4 hours later. When Oliver reached the town at 4 p.m., Lucas had another 180 km to travel. What was Lucas's average speed?
3 m

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Oliver started travelling at 10 a.m. at a speed of 60 km/h towards a town. Lucas started travelling towards the town from the same place 4 hours later. When Oliver reached the town at 4 p.m., Lucas had another 180 km to travel. What was Lucas's average speed?