Question
Zoe was travelling from Point R to Point S at a constant speed of 100 km/h. After 4 hours, she passed a lorry coming from the opposite direction. Zoe travelled another 300 km to reach Point S. At this point, the lorry was still 52 km from Point R. What is the average speed of the lorry?
3 m

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Zoe was travelling from Point R to Point S at a constant speed of 100 km/h. After 4 hours, she passed a lorry coming from the opposite direction. Zoe travelled another 300 km to reach Point S. At this point, the lorry was still 52 km from Point R. What is the average speed of the lorry?