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Important Formulas  Boats and Streams
1. Downstream
In water, the direction along the stream is called downstream.
2. Upstream
In water, the direction against the stream is called upstream.
3. Let the speed of a boat in still water be u km/hr and the speed of the stream be v km/hr, then
Speed downstream = (u + v) km/hr
Speed upstream = (u  v) km/hr.
4. Let the speed downstream be a km/hr and the speed upstream be b km/hr, then
Some more shortcut methods
5. Assume that a man can row at the speed of x km/hr in still water and he rows the same distance up and down in a stream which flows at a rate of y km/hr. Then his average speed throughout the journey
6. Let the speed of a man in still water be x km/hr and the speed of a stream be y km/hr. If he takes tt hours more in upstream than to go downstream for the same distance, the distance
7. A man rows a certain distance downstream in t_{1} hours and returns the same distance upstream in t_{2} hours. If the speed of the stream is y km/hr, then the speed of the man in still water
8. A man can row a boat in still water at x km/hr in a stream flowing at y km/hr. If it takes him tt hours to row a place and come back, then the distance between the two places
9. A man takes nn times as long to row upstream as to row downstream the river. If the speed of the man is x km/hr and the speed of the stream is y km/hr, then
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