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The speed of a boat in still water is 2 km/hr. If its speed upstream be 1 km/hr, then speed of the stream is?

2 km/hr
3 km/hr
1 km/hr
None of these

Correct Answer: 1 km/hr

Explanation:

Speed in upstream = Speed in still water - Speed of stream.
∵ 1 = 2 - x
∴ x = 2 - 1 = 1 km/hr

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