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The speed of a boat in still water is 10 km/hr. If its speed down stream be 13 km/hr, then speed of the stream is?

1.5 km/hr
3 km/hr
11.5 km/hr
5.75 km/hr

Correct Answer: 3 km/hr

Explanation:

Speed in still water + Speed of stream = Speed in downstream.
⇒ 10 + y = 13
∴ y = 13 - 10 = 3 km/hr

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