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Two pipes fill a tank individually in \(x\) hours and \(x+6\) hours, respectively. Together, they fill the tank in 4 hours. How long does the faster pipe take to fill the tank alone?

Answer and explanation

Correct answer: 6 घंटे

The combined filling rate is \(\frac{1}{4}\) tank per hour, so \(\frac{1}{x}+\frac{1}{x+6}=\frac{1}{4}\). On simplification, \(x^2-2x-24=0\), or \((x-6)(x+4)=0\). Since time cannot be negative, \(x=6\), making the other pipe’s time 12 hours. The pipe with the smaller individual time is faster, so the correct answer is 6 hours. Exam tip: In work-rate problems, express each rate as \(1\/\text{time}\) and reject any negative time value.

Related tags

Quadratic EquationsPipes And CisternsWork And TimeWord ProblemsCombined WorkWord Problems And ApplicationsMathematicsClass 10 Mcq

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