<PRE><B>Question 889416</B>
the speed of a boat in still water is 8 km/hr .if it takes same time in going 20 km downstream as it takes in going 12 km upstream ,find the speed of water.
***
let c=speed of water
(8+c)=speed of boat downstream
(8-c)=speed of boat upstream
Travel time=distance/speed
..
{{{20/(8+c)=12/(8-c)}}}
96+12c=160-20c
32c=64
c=2
speed of water=2 km/hr</PRE>