Question
Gavin started travelling at 9 a.m. at a speed of 70 km/h towards a town. Jackson started travelling towards the town from the same place 3 hours later. When Gavin reached the town at 5 p.m., Jackson had another 180 km to travel. What was Jackson's average speed?
3 m

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Gavin started travelling at 9 a.m. at a speed of 70 km/h towards a town. Jackson started travelling towards the town from the same place 3 hours later. When Gavin reached the town at 5 p.m., Jackson had another 180 km to travel. What was Jackson's average speed?