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Boats and Streams - Important Formulas, Logical Reasoning Notes | Study Quantitative Aptitude (Quant) - CAT

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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 
Boats and Streams - Important Formulas, Logical Reasoning Notes | Study Quantitative Aptitude (Quant) - CAT



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 
 

Boats and Streams - Important Formulas, Logical Reasoning Notes | Study Quantitative Aptitude (Quant) - CAT

 

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  Boats and Streams - Important Formulas, Logical Reasoning Notes | Study Quantitative Aptitude (Quant) - CAT


 

7. A man rows a certain distance downstream in t1 hours and returns the same distance upstream in t2 hours. If the speed of the stream is y km/hr, then the speed of the man in still water 
Boats and Streams - Important Formulas, Logical Reasoning Notes | Study Quantitative Aptitude (Quant) - CAT


 

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 
Boats and Streams - Important Formulas, Logical Reasoning Notes | Study Quantitative Aptitude (Quant) - CAT


 

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 
Boats and Streams - Important Formulas, Logical Reasoning Notes | Study Quantitative Aptitude (Quant) - CAT

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