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Pipe ‘A’ can fill 25% of a tank in 4 hours while pipe ‘B’ takes 20 hours to empty fully filled tank. Pipe ‘A’ is opened alone when the tank was empty. After 14 hours, pipe ‘B’ is also opened. In how much time the tank will get filled this way?

A 34 hours

B 30 hours

C 24 hours

D 28 hours

E None of these

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