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

Showing Answers 1 - 4 of 4 Answers

nimmi

  • Jul 27th, 2005
 

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.

  Was this answer useful?  Yes

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 

  Was this answer useful?  Yes

Give your answer:

If you think the above answer is not correct, Please select a reason and add your answer below.

 

Related Answered Questions

 

Related Open Questions