Three pipes P, Q and R can separately fill a cistern in 4, 8 and 12 hours respec

Question

Three pipes P, Q and R can separately fill a cistern in 4, 8 and 12 hours respectively. Another pipe S can empty the completely filled cistern in 10 hours. Which of the following arrangements will fill the empty cistern in less time than others?

Options:

A . Q alone is open

B . P, R and S are open

C . P and S are open

D . P, Q and S are open

Answer: Option D

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