Question
Mary was travelling from Point X to Point Y at a constant speed of 80 km/h. After 2 hours, she passed a bus coming from the opposite direction. Mary travelled another 80 km to reach Point Y. At this point, the bus was still 35 km from Point X. What is the average speed of the bus?
3 m

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Mary was travelling from Point X to Point Y at a constant speed of 80 km/h. After 2 hours, she passed a bus coming from the opposite direction. Mary travelled another 80 km to reach Point Y. At this point, the bus was still 35 km from Point X. What is the average speed of the bus?