I really don’t know but I think I got it wrong
180 is the speed of the motorboat. I don't know the speed of the current.
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120÷4=30
30×6=180
To get the answer you need to find out how many miles she bikes in 10minutes.
Divide 50minutes by 10 you get 5. Now you divide 10(miles) by 5 and you get 2. So it means that in 10minutes she bikes 2miles. Now you need to know how many miles she bikes in 90minutes so if she bikes 2 in 10 then because 90:10=9 you do 2*9=18. She can bike 18miles in 90minutes. :))
Answer:
There are 2 variables in the equation. The variables are y and n
I’m not sure I understand your question