P, Q and R alone can complete a work in 12, 15 and 20 days respectively. In how many days will they together complete the same work?

P, Q and R alone can complete a work in 12, 15 and 20 days respectivel

1.	P, Q and R alone can complete a work in 12, 15 and 20 days respectively. In how many days will they together complete the same work?
A.	4
B.	5
C.	6
D.	3.5
Answer» C. 6

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P, Q and R alone can complete a work in 12, 15 and 20 days respectively. In how many days will they together complete the same work?

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