A boat takes 6 hours to go downstream and upstream a certain distance. It takes 4 hours to travel twice the distance downstream. Which of the following is the ratio of the speed of the boat in still water to the speed of the river? Please, help

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A boat takes 6 hours to go downstream and upstream a certain distance. It takes 4 hours to travel twice the distance downstream. Which of the following is the ratio of the speed of the boat in still water to the speed of the river? Please, help

Mathematics
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At vero eos et accusamus et iusto odio dignissimos ducimus qui blanditiis praesentium voluptatum deleniti atque corrupti quos dolores et quas molestias excepturi sint occaecati cupiditate non provident, similique sunt in culpa qui officia deserunt mollitia animi, id est laborum et dolorum fuga. Et harum quidem rerum facilis est et expedita distinctio. Nam libero tempore, cum soluta nobis est eligendi optio cumque nihil impedit quo minus id quod maxime placeat facere possimus, omnis voluptas assumenda est, omnis dolor repellendus. Itaque earum rerum hic tenetur a sapiente delectus, ut aut reiciendis voluptatibus maiores alias consequatur aut perferendis doloribus asperiores repellat.

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1) 3:1 2) 1:3 3) 5:3 4) 3:5 5) 7:9
Shortest way, please. Can we use any trick to get the answer in shortest time?
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Other answers:

I know how to solve it in neat. All I want is the trick!! :) Here is my logic let x is the speed of the boat y is the speed of the water then the speed of downstream is x +y upstream is x-y Let D is distance of the stream, hence \(\dfrac{D}{x+y}+\dfrac{D}{x-y}=6\\\dfrac{2D}{x+y}=4\) Solve the system. we can get the answer.
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