Question
Risa started travelling at 11 a.m. at a speed of 63 km/h towards a town. Noah started travelling towards the town from the same place 4 hours later. When Risa reached the town at 7 p.m., Noah had another 180 km to travel. What was Noah's average speed?
3 m

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Risa started travelling at 11 a.m. at a speed of 63 km/h towards a town. Noah started travelling towards the town from the same place 4 hours later. When Risa reached the town at 7 p.m., Noah had another 180 km to travel. What was Noah's average speed?