Question
Gabriel started travelling at 9 a.m. at a speed of 70 km/h towards a town. Grace started travelling towards the town from the same place 4 hours later. When Gabriel reached the town at 6 p.m., Grace had another 180 km to travel. What was Grace's average speed?
3 m

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Gabriel started travelling at 9 a.m. at a speed of 70 km/h towards a town. Grace started travelling towards the town from the same place 4 hours later. When Gabriel reached the town at 6 p.m., Grace had another 180 km to travel. What was Grace's average speed?