Question
Nathan started travelling at 9 a.m. at a speed of 75 km/h towards a town. Samuel started travelling towards the town from the same place 3 hours later. When Nathan reached the town at 3 p.m., Samuel had another 180 km to travel. What was Samuel's average speed?
3 m

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Nathan started travelling at 9 a.m. at a speed of 75 km/h towards a town. Samuel started travelling towards the town from the same place 3 hours later. When Nathan reached the town at 3 p.m., Samuel had another 180 km to travel. What was Samuel's average speed?