Question
Mary was travelling from Point C to Point D at a constant speed of 100 km/h. After 5 hours, she passed a bus coming from the opposite direction. Mary travelled another 500 km to reach Point D. At this point, the bus was still 30 km from Point C. What is the average speed of the bus?
3 m

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Mary was travelling from Point C to Point D at a constant speed of 100 km/h. After 5 hours, she passed a bus coming from the opposite direction. Mary travelled another 500 km to reach Point D. At this point, the bus was still 30 km from Point C. What is the average speed of the bus?