Question
Aria started travelling at 9 a.m. at a speed of 84 km/h towards a town. Risa started travelling towards the town from the same place 2 hours later. When Aria reached the town at 5 p.m., Risa had another 180 km to travel. What was Risa's average speed?
3 m

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Aria started travelling at 9 a.m. at a speed of 84 km/h towards a town. Risa started travelling towards the town from the same place 2 hours later. When Aria reached the town at 5 p.m., Risa had another 180 km to travel. What was Risa's average speed?