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When the speed of a boat in still water is 4 km/h and the rate of stream is 2 km/h, find upstream speed of the boat.?

6 km/h
5 km/h
2 km/h
7 km/h

Correct Answer: 2 km/h

Explanation:

Upstream speed of boat = Boat's speed in still water - Rate of stream = 4 - 2 = 2 km/h

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