Question
Aubrey started travelling at 5 a.m. at a speed of 78 km/h towards a town. Isaiah started travelling towards the town from the same place 3 hours later. When Aubrey reached the town at 5 p.m., Isaiah had another 180 km to travel. What was Isaiah's average speed?
3 m

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Aubrey started travelling at 5 a.m. at a speed of 78 km/h towards a town. Isaiah started travelling towards the town from the same place 3 hours later. When Aubrey reached the town at 5 p.m., Isaiah had another 180 km to travel. What was Isaiah's average speed?