Question
Riordan started travelling at 10 a.m. at a speed of 72 km/h towards a town. Hannah started travelling towards the town from the same place 3 hours later. When Riordan reached the town at 4 p.m., Hannah had another 180 km to travel. What was Hannah's average speed?
3 m

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Riordan started travelling at 10 a.m. at a speed of 72 km/h towards a town. Hannah started travelling towards the town from the same place 3 hours later. When Riordan reached the town at 4 p.m., Hannah had another 180 km to travel. What was Hannah's average speed?