Quantitative Aptitude Time and Work Pipe and Cistern

Two pipes X and Y can fill a tank in 12 minutes and 18 minutes, respectively. If both the pipes are opened simultaneously, how long will it take to fill the tank?

1

\(7\frac{1}{5}\) minutes

2

15 minutes

3

\(\frac{5}{36}\) minutes

4

14 minutes

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