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Pipe ‘A’ can fill a tank in 20 hours while pipe ‘B’ takes 30 hours to empty it. Pipe ‘A’ is opened alone when the tank was empty and after 11 hours pipe ‘B’ is also opened. In how much time will the tank get filled completely?

A 35 hours

B 32 hours

C 38 hours

D 33 hours

E None of these

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