Question

a stream goes upstream covers the distance b/w two points in 4hrs while it covers same distance downstream in 3hrs if the speed of stream is 2km/hr find speed of stream in still water​

Answer 1

Answer:

14km/h

Step-by-step explanation:

s=2 km/h

u.s= b-s

d.s=b+s

b=(u.s+d.s)/2

s=(u.s-d.s)/2

let distance be x.

x/u.s=4

x/(b-s)=4

x=4(b-2)

x/d.s=3

x/(b+2)=3

x=3(b+2)

then 4(b-2)=3(b+2)

4b-8=3b+6

b=14km/h

Answer 2

Step-by-step explanation:

Let the distance between the two ports be x km. 

Then, speed downstream = x/4 

And speed upstream = x/5 

Speed of the stream, 

= [speed downstream - speed upstream] / 2

= (x/4 - x/5)/2

Or, (5x -4x)/40 = 2

Or, x/40 = 2 

Thus, x = 80 km.

Distance between two ports = 80 km.