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Pipe ‘A’ can fill 25% of a tank in 3 hours while pipe ‘B’ takes 30 hours to empty fully filled tank. Pipe ‘A’ is opened alone when the tank was empty. After 9 hours, pipe ‘B’ is also opened. In how much time the tank will get filled this way?

A 2 hours

B 14 hours

C 4 hours

D 8 hours

E None of these

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