Question
Betty was travelling from Point Y to Point Z at a constant speed of 90 km/h. After 2 hours, she passed a bus coming from the opposite direction. Betty travelled another 90 km to reach Point Z. At this point, the bus was still 35 km from Point Y. What is the average speed of the bus?
3 m

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Betty was travelling from Point Y to Point Z at a constant speed of 90 km/h. After 2 hours, she passed a bus coming from the opposite direction. Betty travelled another 90 km to reach Point Z. At this point, the bus was still 35 km from Point Y. What is the average speed of the bus?