Question
Mary was travelling from Point F to Point G at a constant speed of 70 km/h. After 4 hours, she passed a van coming from the opposite direction. Mary travelled another 140 km to reach Point G. At this point, the van was still 48 km from Point F. What is the average speed of the van?
3 m

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Mary was travelling from Point F to Point G at a constant speed of 70 km/h. After 4 hours, she passed a van coming from the opposite direction. Mary travelled another 140 km to reach Point G. At this point, the van was still 48 km from Point F. What is the average speed of the van?