Question
Harper started travelling at 11 a.m. at a speed of 60 km/h towards a town. Nora started travelling towards the town from the same place 4 hours later. When Harper reached the town at 6 p.m., Nora had another 180 km to travel. What was Nora's average speed?
3 m

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Harper started travelling at 11 a.m. at a speed of 60 km/h towards a town. Nora started travelling towards the town from the same place 4 hours later. When Harper reached the town at 6 p.m., Nora had another 180 km to travel. What was Nora's average speed?