Question
Esther was travelling from Point X to Point Y at a constant speed of 60 km/h. After 4 hours, she passed a lorry coming from the opposite direction. Esther travelled another 120 km to reach Point Y. At this point, the lorry was still 50 km from Point X. What is the average speed of the lorry?
3 m

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Esther was travelling from Point X to Point Y at a constant speed of 60 km/h. After 4 hours, she passed a lorry coming from the opposite direction. Esther travelled another 120 km to reach Point Y. At this point, the lorry was still 50 km from Point X. What is the average speed of the lorry?