Aptitude - Speed of boat in still water is 10kmph.If it travels 24km downstream,16km upstream in the same amoun

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Speed of boat in still water is 10kmph.If it travels 24km downstream,16km upstream in the same amount of time, what is the speed of the stream?

(a)3kmph

(b)3.5kmph

Total Answers and Comments: 4

Last Update: September 02, 2008

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June 06, 2005 13:34:51

I'm

RE: Speed of boat in still water is 10kmph.If it travels 24km downstream,16km upstream in the same amoun...

24/(10+x) y
16/(10-x) y

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July 27, 2005 10:17:35

nimmi

RE: Speed of boat in still water is 10kmph.If it travels 24km downstream,16km upstream in the same amoun...

another way of doing...a bit lengthy.
speed in still water 0.5(speed up+speed down) 10
0.5((24/t)+(16/t) 10.
therefore time t 2hrs
rate of stream 0.5(speed upstream-speed down)
rate of stream 0.5((24/2)-(16/2)) 2kmph.

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March 13, 2006 06:26:31

thulasi.ram

Member Since: March 2006 Contribution: 1

RE: Speed of boat in still water is 10kmph.If i...

the time taken by the boat in donw stream the time taken by the boat in up stream i.e. (24/(10+x)) (16/(10-x)) where x in the speed of the water 2kmph.

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September 02, 2008 06:45:47

m_manic

Member Since: September 2008 Contribution: 39

RE: Speed of boat in still water is 10kmph.If it travels 24km downstream,16km upstream in the same amount of time, what is the speed of the stream?(a)3kmph(b)3.5kmph(c)2kmph

Speed in still water 10 kmph
stream speed x kmph

down stream speed 10 + x
upstream speed 10 - x

24 / (10 + x ) 16 / (10 - x )

240 - 24 x 160 + 16 x

80 40 x
x 2 kmph

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