Maths A person travels 21 km upstream by boat from point a to point b. After covering that distance it takes 10 hours to come back to point A if he walks 7 km in the direction of the current. The time taken to cover the distance is as much as 3 km in the opposite direction of the current. If it takes to cover the distance, then find the speed of the stream and the speed of the boat in still water?

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