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Pipe ‘P’ and pipe ‘Q’ can fill a tank alone in 40 hours and 60 hours, respectively. If pipe ‘P’ and pipe ‘Q’ were opened together and pipe ‘P’ was closed after 20 hours, then find the time taken by pipe ‘Q’ to fill the remaining portion of the tank alone.

A 15 hours

B 10 hours

C 12 hours

D 6 hours

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