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Pipes P and Q fill a cistern in 12 minut...

Pipes P and Q fill a cistern in 12 minutes when operated together, Q and R fill it in 20 minutes when operated togetehr and P and R fill it in 15 minutes when operated together. In how many minutes can all 3 pipes fill the cistern if operated together?

A

10 minutes

B

2 minutes

C

4 minutes

D

3 minutes

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