A boat can row a distance 6 km upstream in 3 h, and 12 km in 4 h downstream. What is the speed of the boat in still water, and the velocity of the stream respectively?

1
1.5 km/h , 0.5 km/h
2
2.5 km/h, 1 km/h
3
2.5 km/h, 0.5 km/h
4
3 km/h, 1 km/h

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