Given,
Speed in still water=9km/hr
Let the speed of river be x km/hr
12/(x+9) + 12/(9-x) =3
1/4 = 1/(9-x) + 1/(9+x)
= ¼ =(9-x+9+x)/(9-x)(9+x)
=72=9^2-x^2
= x^2=9
X=3
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Answers & Comments
Given,
Speed in still water=9km/hr
Let the speed of river be x km/hr
12/(x+9) + 12/(9-x) =3
1/4 = 1/(9-x) + 1/(9+x)
= ¼ =(9-x+9+x)/(9-x)(9+x)
=72=9^2-x^2
= x^2=9
X=3
speed of boat= 3 km/hr