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Sagot :

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Answer:

We know that the ratio of the distance travel is 3:1 36:12 we then make the distance equal by deviding the distance traveled downstream by 3 we know the speed of the river=5 km/h

x=time it takes to travel upstream

9-x time it takes to travel downstream

5x= 1/3(9-x) (5)

This equation is based on D= (Rate) (Time)

Multipy both sides by 3

15x= (9-x) (5)

Use the distrilbultive property

15x=45-5x

add 5x to both sides

20x=45

Devide both sides by 20 x=2.25 9- x= 6.75

Lets check the ratio to make sure that it is 3:1

6.75/2.25=3

Lets plug into the D= TR To calculate rate

36/6.75=5.33 km/hr

12/2.25=5.33 km/hr

The rate is the same

Step-by-step explanation:

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