Question
Josiah started travelling at 6 a.m. at a speed of 72 km/h towards a town. Sophia started travelling towards the town from the same place 3 hours later. When Josiah reached the town at 6 p.m., Sophia had another 180 km to travel. What was Sophia's average speed?
3 m

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Josiah started travelling at 6 a.m. at a speed of 72 km/h towards a town. Sophia started travelling towards the town from the same place 3 hours later. When Josiah reached the town at 6 p.m., Sophia had another 180 km to travel. What was Sophia's average speed?