Question
Michael started travelling at 9 a.m. at a speed of 81 km/h towards a town. Riordan started travelling towards the town from the same place 2 hours later. When Michael reached the town at 5 p.m., Riordan had another 180 km to travel. What was Riordan's average speed?
3 m

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Michael started travelling at 9 a.m. at a speed of 81 km/h towards a town. Riordan started travelling towards the town from the same place 2 hours later. When Michael reached the town at 5 p.m., Riordan had another 180 km to travel. What was Riordan's average speed?