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}