Question

a streamer goes downstream from one point to another in 9 hours it covers the same distance upstream in 11 hours if the speed of the stream be 3 kilometre per hour then the distance between the points is​

Answer 1

speed of upstream s=3 kmph

speed of man in upstream =x-3 kmph

" " " " downstream=x+3 km/h

time taken in upstream =9 hrs

" " " downstream=11 hrs

distance d is constant

then,

(x-3)/9 =(x+3)/11

11x-33 =9x+9

2x = 42

x=24 km/h

d=(x-3)/9

d=(24-3)/9

d=21/9

d= 2.33 km Ans.

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