Question
Hilda was travelling from Point Q to Point R at a constant speed of 60 km/h. After 3 hours, she passed a bus coming from the opposite direction. Hilda travelled another 120 km to reach Point R. At this point, the bus was still 30 km from Point Q. What is the average speed of the bus?
3 m

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Hilda was travelling from Point Q to Point R at a constant speed of 60 km/h. After 3 hours, she passed a bus coming from the opposite direction. Hilda travelled another 120 km to reach Point R. At this point, the bus was still 30 km from Point Q. What is the average speed of the bus?