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Pipe ‘A’ can fill a tank in 30 hours whereas leak ‘A’ can empty it in 45 hours. If they both operate along with pipe ‘B’, then the given tank gets filled in 20 hours. How much time is needed to fill the given tank if pipe ‘B’ and leak ‘A’ work together?

A 37.5 hours

B 60 hours

C 30 hours

D 22.5 hours

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