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Stations A and B are 60 km apart on a highway. One truck starts from A and another one from B at the same time. If they travel in the same direction, they meet in 6 hours. But if they travel towards each other, they meet in one hour. The speeds of the two trucks respectively are:
- A45 and 15 km/h
- B40 and 20 km/h
- C35 and 25 km/h
- D30 and 30 km/h
Answer not set