Question 377620
Let x=time it take larger pipe to fill tank and y =time it take larger pipe to fill tank.
y=x+18
1/x + 1/y = 1/12
1/x + 1/(x+18) = 1/12
12(x+18)+12x=x(x+18) Multiply by 12x(x+18)
12x+216+12x=x^2+18x
x^2-6x-216=0
x=18 hr
y=36 hr
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Ed