P and Q can do a work in 12 days and 16 days respectively. P started work alone. After how many days should Q join P, so that the work is finished in 9 days?

P and Q can do a work in 12 days and 16 days respectively. P started w

1.	P and Q can do a work in 12 days and 16 days respectively. P started work alone. After how many days should Q join P, so that the work is finished in 9 days?
A.	4
B.	2
C.	3
D.	5
Answer» E.

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P and Q can do a work in 12 days and 16 days respectively. P started work alone. After how many days should Q join P, so that the work is finished in 9 days?

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