Quantitative Aptitude Boats and Streams Study Material
Upstream : If a person/swimmer, boat or ship moves against the stream i.e., in the direction opposite to that of the stream, it is called upstream.
Downstream: If a person/swimmer, boat or ship moves with the stream i.e., along the direction of the stream, it is called downstream.
Assumption : When we simply say speed of the boat or swimmer, it usually means speed in the still water.
Important Results:
Let the speed of the boat or swimmer in still water be Z km/hr and the speed of the stream or the current be S km/hr
Then the boat or the swimmer has
Down stream Speed = (Z+ S) km/hr
Up stream Speed = (Z - S) km/hr .
On adding the above two relationships and dividing by 2 we get
Let the speed of the boat or swimmer in still water be Z km/hr and the speed of the stream or the current be S km/hr
Then the boat or the swimmer has
Down stream Speed = (Z+ S) km/hr
Up stream Speed = (Z - S) km/hr .
On adding the above two relationships and dividing by 2 we get
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