Type 1 : Speed of boat in still water and speed of stream are given separately. Correct answer : b Hint: In downstream, water stream increases the speed of boat as they both are along the same directions. Average speed of boat and stream 120, both the speeds are average speed of boat and stream 120. Find a speed of stream b speed of boat in still water. 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. Very useful for freshers, engineers, software developers taking entrance exams. Learn and take practice tests!
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Find a speed of stream b speed of boat in still water Examples: Q 3. What would be the average speed of boat and stream 120 of swimmer in still water? Examples: Q 5.
What would be the average speed of boat during the journey? Examples: Q 7.
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Do you want me to help you? Login Sign Up. Formula 1: If the ratio of downstream and upstream speeds is D: U, then ratio of time taken will be U : D. Question: A boat running upstream takes 8 hours 48 minutes to cover a certain distance, while it takes 4 hours to cover the same distance running downstream. What is the ratio between the speed of the boat and speed of the water current respectively?
Solution: When 8 hours 48 minutes is written using mixed fractions,. Therefore, the ratio of the time taken becomes Which on solving gives, Now, as the ratio of time is inversely proportional to that of Upstream and Downstream speeds. Now, the ratio of speed of boat and the speed of stream will be.
How far is the place? Solution: Take out the formula book. A man rows a certain distance downstream in X hrs and returns the same distance in Y hrs.
Question: Ramesh can row a certain distance downstream in 6 hrs and returns the same distance in 9 hrs. Formula 4: A man rows a certain distance downstream in X hrs and returns the same distance in Y hrs. Let us now jump to the questions, 1. A boat covers a distance of 30 km in 3 hrs in the direction of stream and covers same distance in 5 hrs in opposite direction of Average Speed Of Boat And Stream 150ml the stream.
Important: If the boat takes t down and t up respectively to travel same downstream and upstream distance, then we the following relation:. Question 4: A boat takes 6 hours to go downstream and comes back upstream in 12 hours.
Find the ratio of the speed of the boat and the speed of the stream. Question 5: A man rows 10 km upstream and back again to the starting point in 55 min. If Average Speed Of Boat And Stream 150 the speed of the stream is 2 kmph, then find the speed of the boat in still water. It takes 15 hr to reach its destination and return back if river has no flow. For the same journey it takes 16 hr if river is flowing.
Find speed of flow of river. Your email address will not be published. Skip to content Boats and Streams is an essential topic for many competitive exams. Boats and Streams � Terminologies: Stream: It implies that the water in the river is moving or flowing. Standard Method: Let one side the distance be d km. Therefore, the average speed of the boat Shortcut Formula: Average Speed Finding the ratio of speeds of the boat and the stream Important: If the boat takes t down and t up respectively to travel same downstream and upstream distance, then we the following relation: Question 4: A boat takes 6 hours to go downstream and comes back upstream in 12 hours.
Standard Method: Let the common distance be d km. Finding the total time of the journey. Shortcut Formula: Let the speed of the boat in still water be x kmph. Leave a Comment Cancel Reply Your email address will not be published.
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