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span >Pipe ‘A’ and pipe ‘B’, together can fill 20% of a tank in 7 hours while pipe ‘C’ takes 42 hours to empty it. Pipe ‘A’ and pipe ‘B’ were opened together. After 30 hours, pipe ‘C’ is also opened. Find the total time taken to fill the empty tank this way.

A 60 hours

B 42 hours

C 50 hours

D 45 hours

E 35 hours

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