Question 1091897
x, time for the hose alone


{{{1/(x-1)+1/x=1/7}}}

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{{{7x+7(x-1)=x(x-1)}}}
{{{7x+7x-7=x^2-x}}}
{{{14x-7=x^2-x}}}
{{{x^2-15x+7=0}}}


{{{x=(15+- sqrt(225-4*7))/2}}}
(only one alternative will be right.)
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