Two pipes P and Q together can fill a tank in 35/6 minutes. Another two pipes i.e. pipe R having efficiency twice of pipe P and pipe S having efficiency half of pipe Q can together fill the same tank in 140/33 minutes. Find the ratio of the time taken by pipe P and the time taken by pipe Q alone to fill the tank.

Two pipes P and Q together can fill a tank in 35/6 minutes. Another tw

1.	Two pipes P and Q together can fill a tank in 35/6 minutes. Another two pipes i.e. pipe R having efficiency twice of pipe P and pipe S having efficiency half of pipe Q can together fill the same tank in 140/33 minutes. Find the ratio of the time taken by pipe P and the time taken by pipe Q alone to fill the tank.
A.	7 : 9
B.	3 : 4
C.	5 : 7
D.	Can't be determined
E.	None of these
Answer» D. Can't be determined

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