Discussion :: Boats and Streams - General Questions (Q.No.1)
|Balaji said: (Mar 18, 2011)|
|In the question they given the data that
speed of boat 13 km/hr and speed of stream is 4 km/hr
and they asked us to solve the time taken by the boat in down stream for a distance of 68 kms.
we know as per the formula down stream means speed of boat + speed of stream
down stream = 13+4=17 km/hr
as per the problem we got to find time taken by boat to travel a distance of 68km down stream.
we have formula that, time=distance/speed
|Manasa said: (Jun 12, 2011)|
|Geetha said: (Jun 16, 2011)|
|Thanks for your explanation.|
|Anshu said: (Apr 4, 2012)|
|Total speed during downstream,
Speed = 13kmph + 4 kmph = 17 kmph.
Time = distance / speed = 4 hours.
Hope this helps!
|Arun.D said: (Jun 3, 2013)|
|Speed of boat in still water = 13km/hr.
Speed of the stream = 4km/hr.
Time taken by the boat to go 68 km downstream = ?
Speed of boat in downstream = (13+4)km/hr.
Time = distance/speed.
|Akash U. said: (Jan 25, 2014)|
|(Total speed)downstream = Speed of boat + Speed of stream.
Time = Distance/speed.
|Wangdeep Tamang said: (Mar 22, 2014)|
|Speed in Still water = 13 km/h.
Speed of the stream = 4 km/h.
Downstream = 13+4 = 17km (speed in Still water + speed of the stream).
Time Take = 68/17 = 4 hrs.
|Manikyam said: (Apr 7, 2015)|
|How to know particularly which formula to use whether downstream or upstream? Bit confusing?|
|Somya said: (May 27, 2015)|
|It is given in the question to find time taken to go 68 km downstream.|
|Srikanth said: (Jun 24, 2015)|
|Downstream speed = a.
Upstream speed = b.
Stream speed = 1/2 (a-b)----Formula.
Boat speed = 1/2 (a+b)-----Formula.
Given boat speed = 13.
Stream speed = 4.
So 1/2(a+b)+1/2(a-b) = 13+4.
Given D = 68km.
D = S*T.
Ta = D/Sa.
So time taken by the boat to go 68 km downstream is 4 hrs.
|Prassanna.S said: (Aug 19, 2015)|
|Thanks for giving the correct answer.|
|V!Cky said: (Sep 6, 2015)|
|Use Speed = Distance /Time formula.
Still in water u+v = 13+4 = 17.
68/17 = 4 km/hr.
|Roshan said: (Sep 12, 2015)|
|Still water speed + Boat speed = Total speed (down stream).
Time = Distance/Speed.
|Praveen said: (Oct 14, 2015)|
|Still water means? How it has speed?|
|Chetan said: (Dec 12, 2015)|
|It means speed of boat in still water is 13 km/h.|
|Laxmidhar said: (Dec 16, 2015)|
|Sp of down stream = (13+4) = 17.
Time taken = 68\17 = 4 hr.
|Csharad said: (Mar 19, 2016)|
|Here any short cut method for this?|
|Kiruthika said: (Jun 28, 2016)|
Speed in still water U = 13 km/hr,
Speed of stream V = 4 km/hr,
Distance = 68 km,
Time = ?
Time = distance / U+V(downstream speed)
=> 4 hour.
|Sivananda said: (Jul 7, 2016)|
|Super explanation @Balaji. Thanks.|
|Avijit Das said: (Jul 24, 2016)|
|Appropriate explanation, Thanks to all.|
|Honey said: (Aug 10, 2016)|
|Good explanation, Thanks to all.|
|Gaurank Verma said: (Aug 25, 2016)|
|Since ship is going downstream,
Resultant speed = 13 + 4 = 17 km/h.
Time = distance / speed.
==> Time = 68/17 = 4hours.
Therefore, the boat will take 4 hrs. To go 68 km downstream.
|Narayana Reddy said: (Sep 23, 2016)|
|Thanks for providing the answer and explanation.|
|Raj said: (Jan 19, 2017)|
|Hi, please give me a solution for this question.
"A man can row 8 kms in still water. If in a river flowing at 2 km an hour, it takes him 24 minutes to row to a place and come back, how far of is this place?"
|A.Santhosh said: (Apr 2, 2017)|
|Boat -> a kmph& stream-> b kmph
A= boat speed at still water
B= water speed=rate of current=stream speed.
Along with the flow, Dss(downstream speed) = a+b,
Againist with the flow, Uss(upstream speed) = a-b.
So, a + b = 13 + 4 = 17,
Distance = 68 km,
Time = Dist/Uss,
T = 68/17 = 4hrs.
|Vadivel said: (Apr 6, 2017)|
|Thaks for explaining the answer friends.|
|Birla Jyothi Swaroop said: (Apr 27, 2017)|
|Perfect Explanation, thank @Santhosh.|
|Ardhendu Sikdar said: (Jun 17, 2017)|
|13+4 = 17km/hr.
Now, 48/17 = 4hr.
|Mythu said: (Jul 26, 2017)|
|Thanks for all your explanations.|
|Elizabath said: (Mar 13, 2018)|
|Give a clear explanation to get it.|
|Sheetul said: (Sep 9, 2018)|
|Thank you so much @Balaji.|
|Gauravbagul said: (Nov 18, 2018)|
|13+4 = 17km/hr,
For 1 hour he goes 17 km.
Then for 68 km he takes 4 hrs.
|Md Abdul Khabir said: (Jul 30, 2019)|
|Thank you all for explaining it clearly.|
|Venky said: (Aug 1, 2019)|
|Thanks to all for giving an explanation.|
|Bhushan Roy said: (Sep 6, 2019)|
|Thanks for the nice explanation.|
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