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Pipe ‘A’ and pipe ‘B’ can fill a cistern in 15 minutes and 36 minutes respectively. Pipe ‘C’ alone can empty the cistern in 12 minutes. If all three pipes are opened together then what is the time taken to fill 50% of the cistern?

A 45 minutes

B 14.4 minutes

C 22.5 minutes

D 7.5 minutes

E None of these

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