P, Q and R can complete a piece of work in 45, 15 and 5 days respectively. In how may days all three together can complete the same work?

P, Q and R can complete a piece of work in 45, 15 and 5 days respectiv

1.	P, Q and R can complete a piece of work in 45, 15 and 5 days respectively. In how may days all three together can complete the same work?
A.	45/14
B.	45/13
C.	9/2
D.	11/2
Answer» C. 9/2

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P, Q and R can complete a piece of work in 45, 15 and 5 days respectively. In how may days all three together can complete the same work?

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