Answered: A boat can travel at a speed of 8 km/h…

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A boat can travel at a speed of 8 km/h in still water on a lake. In the flowing water of a stream, it can move at 8 km/h relative to the water in the stream. If the stream speed is 3 km/h, how fast can the boat move past a tree on the shore in travelling (A) upstream (B) downstream?

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