Question
Harris started travelling at 11 a.m. at a speed of 72 km/h towards a town. Isabella started travelling towards the town from the same place 2 hours later. When Harris reached the town at 7 p.m., Isabella had another 180 km to travel. What was Isabella's average speed?
3 m

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Harris started travelling at 11 a.m. at a speed of 72 km/h towards a town. Isabella started travelling towards the town from the same place 2 hours later. When Harris reached the town at 7 p.m., Isabella had another 180 km to travel. What was Isabella's average speed?