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

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

Correct Answer: 1 km/hr

Explanation:

Let the speed of stream be x km/hr
Then, speed upstream = (2 - x ) km/hr
⇒ 2 - x = 1
∴ x = 1 km/hr

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