Capgemini
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Numerical Ability
Boats and Streams
A speedboat whose speed is 15 kmph in still water goes 30 kmph downstream and comes back in a total of 4hrs 30min. What is the speed of the stream in kmph?
Read Solution (Total 17)
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- sorry
the answer is 5kmph
solution:-
Let the speed of the stream be x km/hr. Then,
Speed downstream = (15 + x) km/hr,
Speed upstream = (15 - x) km/ph
30/(15+x)+30/(15-x)=4.5
solve for x
x=5kmph
x = 5 km/hr. - 10 years agoHelpfull: Yes(20) No(3)
- but 30kmph is not the distance
- 10 years agoHelpfull: Yes(14) No(5)
- i think its 15 km/hr... bcoz
ds=boatspeed + streamspeed (let stream speed = x)
=> 30=15 + x
=> x = 15 km / hr
- 10 years agoHelpfull: Yes(12) No(7)
- Ans is 5 kmph
Sorry speed of the strem is 5kmph
let x is apeed of stream
30/(15+x)+30/(15-x)=4.5
solve for x you will get x=5 - 10 years agoHelpfull: Yes(9) No(2)
- let the speed of boat in still water=x kmph
speed of stream= y kmph
down stream=ds
ds=x+y
y=ds-x=30-15=15kmph - 10 years agoHelpfull: Yes(4) No(7)
- ans is 5kmph..
as we know the formula,speed downstream=(speed in still water+speed of stream)
now,let speed of stream be x..
so,by the given formula we get
30=(15+x)..
again in the given question the boat comes back,so 30=(15-x)
Therefore,by the given 2equations,
30/(15+x) + 30/(15-x)=4.5(time given)
solving we see,x=5
Hence the speed of the stream is 5kmph.. - 10 years agoHelpfull: Yes(4) No(0)
- ans is 20 km/p
the speed of water is 20 km per hour - 10 years agoHelpfull: Yes(2) No(9)
- In this question , it should be "A speedboat whose speed is 15 kmph in still water goes 30 km downstream " and not 30kmph !!!
- 10 years agoHelpfull: Yes(2) No(0)
- hear distance is not 30 km
I think answer is 15 kmph because in downstream boat speed= speed in still water + stream speed
So, 15 + stream speed = 30 =====.> strem speed = 15 kmph
- 10 years agoHelpfull: Yes(1) No(1)
- Let the speed of the stream be x km/hr. Then,
Speed downstream = (15 + x) km/hr,
Speed upstream = (15 - x) km/hr.
30 + 30 = 4 1
(15 + x) (15 - x) 2
900 = 9
225 - x2 2
9x2 = 225
x2 = 25
x = 5 km/hr.
****note: 30 km downstream means it goes 30 km.It is distance - 10 years agoHelpfull: Yes(1) No(3)
- if 30kmph is the combined speed then the answer will be 30-15=15
but if it is distance 30 km then answer is 5kmph - 10 years agoHelpfull: Yes(1) No(1)
- the question is given wrong
A speedboat whose speed is 15 kmph in still water goes 30 km downstream and comes back in a total of 4hrs 30min. What is the speed of the stream in kmph
that is the exact ques.
and ans is 5 km.
A speedboat whose speed is 15 kmph in still water goes 30 kmph downstream and comes back in a total of 4hrs 30min. What is the speed of the stream in kmph
- 10 years agoHelpfull: Yes(1) No(1)
- Let the speed of the stream be x km/hr. Then,
Speed downstream = (15 + x) km/hr,
Speed upstream = (15 - x) km/hr.
30 + 30 = 4 1
(15 + x) (15 - x) 2
900 = 9
225 - x2 2
9x2 = 225
x2 = 25
x = 5 km/hr. - 7 years agoHelpfull: Yes(1) No(1)
- speed of stream= downstream speed - speed of the boat in still water
= 30-15=15kmph - 10 years agoHelpfull: Yes(0) No(1)
- ans 15kmph.
speed of boat=15 kmph
downstream= 30 kmph
downstream= speed of boat+ speed of stream
30=15+speed of stream
speed of stream = 15 kmph (i think its correct) - 10 years agoHelpfull: Yes(0) No(1)
- speed of stream is 3kmph
- 9 years agoHelpfull: Yes(0) No(1)
- the question is wrong
at the place of 30 kmph it should be 30 km only ...
than correct answer is 5
i ask u one question those who are telling answer as 15
if the speed of boat as well as the steam both become 15 how it is possible to a boat to be come back . (it only go by a speed of 15+15=30 but while returning time speed will be 15-15= 0 so not possible to come back ) - 8 years agoHelpfull: Yes(0) No(1)
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