Downstream

Downstream

In water,the direction along the stream is called downstream. I mean, If a boat or a swimmer swims in the same direction as the stream, then it is called downstream. Obviously the boat or swimmer require less efforts to travel using downstream. Because the stream itself helps the objects to move.

Remember, as the object moves along with the water, the stream helps the object.
So, the down stream speed (DS) is
DS =  U+V
where U is the speed of the object in the still (calm) water
V is the speed of the water.

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