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  • Boats and Streams Formulas and Facts


    1. Boat going Downstream:
    If boat is going in the direction of water flow then it is called boat going downstream.

    2. Boat going Upstream:
    If boat is going opposite to the direction of water flow then it is called boat going upstream.

    3. Speed Downstream: If the speed of a boat in still water is u km/hr and the speed of the stream is v km/hr, then:

    Speed downstream = (u + v) km/hr.

    Means the speed of stream and of boat will be added.


    4. Speed Upstream: If the speed of a boat in still water is u km/hr and the speed of the stream is v km/hr, then:

    Speed upstream = (u - v) km/hr.

    5. If the speed downstream of boat is a km/hr and the speed upstream of boat is b km/hr, then

    \begin{aligned}

    \text{Speed in still water =}\frac{1}{2}(a+b) km/hr \\

    \text{Speed of stream =}\frac{1}{2}(a-b)km/hr \\
    \end{aligned}