Question
Kathy was travelling from Point R to Point S at a constant speed of 70 km/h. After 4 hours, she passed a lorry coming from the opposite direction. Kathy travelled another 140 km to reach Point S. At this point, the lorry was still 30 km from Point R. What is the average speed of the lorry?
3 m

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Kathy was travelling from Point R to Point S at a constant speed of 70 km/h. After 4 hours, she passed a lorry coming from the opposite direction. Kathy travelled another 140 km to reach Point S. At this point, the lorry was still 30 km from Point R. What is the average speed of the lorry?