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Pipe ‘A’ can fill a tank in 60 hours whereas leak ‘A’ can empty it in 70 hours. If they both operate along with pipe ‘B’, then the given tank gets filled in 35 hours. How much time is needed to fill the given tank if pipe ‘B’ and leak ‘A’ work together?

A 40 hours

B 60 hours

C 75 hours

D 30 hours

E 84 hours

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