Question
Caleb started travelling at 10 a.m. at a speed of 83 km/h towards a town. Riordan started travelling towards the town from the same place 2 hours later. When Caleb reached the town at 7 p.m., Riordan had another 180 km to travel. What was Riordan's average speed?
3 m

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Caleb started travelling at 10 a.m. at a speed of 83 km/h towards a town. Riordan started travelling towards the town from the same place 2 hours later. When Caleb reached the town at 7 p.m., Riordan had another 180 km to travel. What was Riordan's average speed?