Three pipes P, Q and R can separately fill a cistern in 4,8 and 12 hou – McqOptions

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1.	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 ?
A.	Q alone is open.
B.	p and S are open
C.	P. R and S are open
D.	P. Q and S are open.
Answer» E.

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