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Pipes A, B and C are attached to an empt...

Pipes A, B and C are attached to an empty cistern. While the first two can fill the cistern in 4 and 10 hours, respectively, the third can drain the cistern, when filled, in 6 hours. If all the three pipes are opened simultaneously when the cistern is three-fifth full, how many hours will be needed to fill the cistern?

A

`36/11`

B

`48/11`

C

`60/11`

D

`24/11`

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