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A streamer going downstream in a river covers the distance between two towns in 20 hrs. coming back upstream it covers the distance in 25hrs. the speed of

water is 4km per hr.find the distance between two towns.


Let the speed of the boat be 'x' kmph. then the speed in downstream will be = (x+4)kmph. the speed in upstream will be=(x-4) kmph. . now we have ,20(x+4)=25(x-4). 20x+80=25x-100 80+100=25x-20x. 180=5x. x=180/5 . x=36
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