Question
David started travelling at 8 a.m. at a speed of 69 km/h towards a town. Risa started travelling towards the town from the same place 4 hours later. When David reached the town at 4 p.m., Risa had another 180 km to travel. What was Risa's average speed?
3 m

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David started travelling at 8 a.m. at a speed of 69 km/h towards a town. Risa started travelling towards the town from the same place 4 hours later. When David reached the town at 4 p.m., Risa had another 180 km to travel. What was Risa's average speed?