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Pipe ‘A’ and pipe ‘B’ can fill a cistern in 20 minutes and 12 minutes respectively. Pipe ‘C’ alone can empty the cistern in 10 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 15 minutes

D 7.5 minutes

E None of these

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