P and Q can do a piece of work in 15 days, Q and R in $$ {22{1 over 2}}$$ days, P and R in 30 days. They all work at it for 9 days and then P leaves but Q and R go on together for 6 days more. If then Q leaves, how long will R take to complete the work?

P and Q can do a piece of work in 15 days, Q and R in $$ {22{1 over 2}

1.	P and Q can do a piece of work in 15 days, Q and R in $$ {22{1 over 2}}$$ days, P and R in 30 days. They all work at it for 9 days and then P leaves but Q and R go on together for 6 days more. If then Q leaves, how long will R take to complete the work?
A.	14 days
B.	18 days
C.	15 days
D.	16 days
E.	12 days
Answer» D. 16 days

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P and Q can do a piece of work in 15 days, Q and R in $$ {22{1 over 2}}$$ days, P and R in 30 days. They all work at it for 9 days and then P leaves but Q and R go on together for 6 days more. If then Q leaves, how long will R take to complete the work?

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