Question
John started travelling at 9 a.m. at a speed of 81 km/h towards a town. Ethan started travelling towards the town from the same place 4 hours later. When John reached the town at 9 p.m., Ethan had another 180 km to travel. What was Ethan's average speed?
3 m

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John started travelling at 9 a.m. at a speed of 81 km/h towards a town. Ethan started travelling towards the town from the same place 4 hours later. When John reached the town at 9 p.m., Ethan had another 180 km to travel. What was Ethan's average speed?