The direction of the stream is said as downstream of a river or stream and the direction completely opposite to the river flowing is called as upstream of a stream. The speed of a person rowing boat can be calculated using this simple boat speed upstream downstream formula in this page. This formula guides you to calculate the speed of a boat in upstream and downstream based on the speed of the boat in still water and speed of the stream or river flowing at a particular speed.

Speed in downstream (km/hr) = a - b

Where,

a = Speed of a boat in still water (km/hr)

b = Speed of the stream (km/hr)

The above boat speed upstream downstream formula in this page is a useful formula for the students preparing for the competitive exams as there will be a considerable amount of problems based on boat and stream.