Quantitative Aptitude Time and Work Pipe and Cistern

Three taps x, y and z are can fill an empty tank in 20 mins, 30 mins and 40 mins, If all taps are opened and tap y and z got closed after 6 mins then total what time take to fill the tank?

1

10 mins

2

11 mins

3

13 mins

4

15 mins

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