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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