Question
Henry started travelling at 5 a.m. at a speed of 72 km/h towards a town. Isabella started travelling towards the town from the same place 4 hours later. When Henry reached the town at 3 p.m., Isabella had another 180 km to travel. What was Isabella's average speed?
3 m

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Henry started travelling at 5 a.m. at a speed of 72 km/h towards a town. Isabella started travelling towards the town from the same place 4 hours later. When Henry reached the town at 3 p.m., Isabella had another 180 km to travel. What was Isabella's average speed?