# If it takes 6 hours for a person to travel downstream and 12 hours to travel upstream. And the speed of the boat is 3 km/hour, what is the speed of the river?

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then the speed in downstream will be= (x+3)kmph

the speed in upstream will be= (x-3)kmph

now we have, 6(x+3)=12(x-3)

6x+18=12x-36

18+36=12x+6x

54=18x

x=54/18

x=3

::speed of the river is 3 kmph

Then the speed in downstream = (x+3)km/h

speed in upstream = (x-3)km/h

As per question

=6x+18=12x-36

=18+36=12x-6x(transpose)

6x=54

x=54/6

x=9

::speed of the river is 9 km/h