AFCAT I 2021 Solved Paper

let the speed of the man is xkmph and the speed of the stream is ykmph. Then
10=

32

x−y

+

40

x+y

⇒16X+20Y=5...(i) [

1

x−y

=X,

1

x+y

=Y]
And 12=

38

x−y

+

50

x+y

⇒19X+25Y=6.......(ii)
By both equations, we get X=

1

x−y

=

1

4

⇒x−y=4
And Y=

1

x+y

=

1

20

⇒x+y=20
After solving, we get the speed of the stream is 8kmph.