If A, B and C alone can complete a work in x, y and z days respectively, then in how many days will they complete the same work, working together?

\(\frac{{x + y + z}}{{xyz}}\) days

\(\frac{{xy + yz + zx}}{{xyz}}\) days

\(\frac{{xyz}}{{xy + yz + zx}}\) days

If A, B and C alone can complete a work in x, y and z days respectivel

1.	If A, B and C alone can complete a work in x, y and z days respectively, then in how many days will they complete the same work, working together?
A.	\(\frac{{x + y + z}}{{xyz}}\) days
B.	\(\frac{{xy + yz + zx}}{{xyz}}\) days
C.	\(\frac{{xyz}}{{xy + yz + zx}}\) days
D.	None of the above
Answer» D. None of the above

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If A, B and C alone can complete a work in x, y and z days respectively, then in how many days will they complete the same work, working together?

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