Math

When two hoses are connected to a swimming pool, they can fill the pool in 4 hours if both are open. If only the larger hose is open, it can fill the pool in 6 hours less than the smaller hose. How long will it take tge smaller hose to fill the swimming pool if it works alone?
Use quadratic equation
Someone solve it pls i need help :(

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  1. 1/x + 1/(x-6) = 1/4
    x = 12

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