Question
Jackson started travelling at 6 a.m. at a speed of 90 km/h towards a town. Stella started travelling towards the town from the same place 3 hours later. When Jackson reached the town at 6 p.m., Stella had another 180 km to travel. What was Stella's average speed?
3 m

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Jackson started travelling at 6 a.m. at a speed of 90 km/h towards a town. Stella started travelling towards the town from the same place 3 hours later. When Jackson reached the town at 6 p.m., Stella had another 180 km to travel. What was Stella's average speed?