Discussion :: Boats and Streams - Data Sufficiency 2 (Q.No.1)
Each of the questions given below consists of a question followed by three statements. You have to study the question and the statements and decide which of the statement(s) is/are necessary to answer the question.
|Tarandeep said: (Nov 26, 2012)|
|How this formula for Avg Speed is calculated?|
|Amit said: (Nov 9, 2013)|
|Avg. speed = Total distance / Total time = 2L / t1 + t2.
Time = distance / speed so, t1 = L / x and t2 = L / y.
t1 + t2 = L(x+y) / xy.
Total time = L(x+y) / xy.
Total distance = 2L.
Avg. speed = 2xy/x+y.
|Aman said: (Dec 3, 2013)|
|Can anybody tell me how we get the value 4 in that average speed formula you have putted.|
|Aashit said: (Jun 25, 2014)|
|Why has 4 been substituted for 'x' when 4=x+y?|
|Rahul said: (Feb 15, 2015)|
|x is the speed of the boat upstream, and y is the speed of the boat downstream.|
|Swarnashree said: (Aug 28, 2015)|
|Why x is taken as speed of the boat upstream?|
|Shashi said: (Oct 22, 2016)|
|How is statement 3 related to question?
There is no need of 3rd statement or no relation b/w 3rd to another statement.
|Harshavardan said: (Jan 10, 2017)|
Upstream is 4kmps and downstream is 12kmps.
Boat speed still in water =(down stream+upstream)/2 = (1/2) * (12+4) = 8kmps.
Boat speed against the water =(down stream-upstream)/2 = (1/2) * (12-4) = 4kmps.
So, Statments 1&2 are efficient to get this answer.
Answer is Option "A".
|Priya said: (May 6, 2018)|
Therefore the answer is 0.
But unfortunately, the answer is not 0.
Because any answer cannot be 0.
So, we increment the answer by 1 to avoid any problems.
Therefore the answer is 1.
|Abhilasha said: (Jul 17, 2018)|
|3rd statement itself is enough as [(u+v)+(u-v)]/2=6.
Which gives u = 6; where u is the speed of the boat in still water and v is the speed of the stream.
|Kapadiya Sagar said: (Jun 26, 2020)|
|Options 1 and 3 become same.
a+b = 6kmph.
So with one equation two unknown is not solvable.
So, the Correct option is [A].
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