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Lesson Selected problems from the archive on the boat floating Upstream and Downstream Sep 26, �� The speed of the swimmer or boat downstream = (x + y) km per hour In the stationary or still water The speed of the boat is given by = 1/2 (downstream speed + upstream speed) The speed of the stream is provided by = 1/2 (downstream speed � upstream speed). The net speed of the boat in this case is called upstream speed. Let the speed of the boat in still water is 'b' km/hr and the speed of the stream is 'w' km/hr. When the boat goes downstream then the speed will be (b + w) km/hr as in this case the water will take the boat along with it. Speed downstream = 48 20 = km/h Speed upstream = 48 24 = 2 km/h Therefore, Speed of boat in still water = 1 2 ( + 2) = 2 = km/h.
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Find the distance covered by the boat between two points. Next Page �. If there's no mention of stream speed in the question, assume it to be the speed of boat in still water. So, water stream increases the speed of boat. Hence, speeds are added while going downstream.

So, water stream decreases the speed of boat due to opposite flow. Hence, speeds are subtracted while going upstream.

If you just remember this concept, you won't need to remember and recall the above formula while solving the problems. Halving this would give you the speed of the current. Once you know how to deal with these 4 types of problems, the chapter should be an easy one for you. Question Variety: Type 1 : Speed of boat in still water and speed of stream are given separately. Alligation or Mixtures - Aptitude test, questions, shortcuts, solved example videos Alligation or Mixtures - Quantitative aptitude tutorial with easy tricks, tips, short cuts explaining the concepts.

Online aptitude preparation material with practice question bank, examples, solutions and explanations. Speed of the boat in still water B. This code is contributed by Anant Agarwal. Recommended Articles. Find the speed of the stream from the speed of the man given in both upstream and downstream. Article Contributed By :. Easy Normal Medium Hard Expert. Most popular in School Programming. More related articles in School Programming.

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