Quantitative Aptitude Time and Work Pipe and Cistern

Two pipes X and Y can fill a cistern in 24 min. and 32 min. respectively. If both the pipes are opened together, then after how much time Y should be closed so that the tank is full in 18 minutes ? 

1
6 min.
2
8 min.
3
10 min.
4
12 min.

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