Question
Esther was travelling from Point R to Point S at a constant speed of 75 km/h. After 4 hours, she passed a van coming from the opposite direction. Esther travelled another 150 km to reach Point S. At this point, the van was still 40 km from Point R. What is the average speed of the van?
3 m

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Esther was travelling from Point R to Point S at a constant speed of 75 km/h. After 4 hours, she passed a van coming from the opposite direction. Esther travelled another 150 km to reach Point S. At this point, the van was still 40 km from Point R. What is the average speed of the van?