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Boats and Streams

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  1. 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. 1.5 km/hr
    2. 3 km/hr
    3. 11.5 km/hr
    4. 5.75 km/hr
Correct Option: B

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


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