X and Y can complete a work in 10 days, Y and Z in 12 days and X and Z – McqOptions

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1.	X and Y can complete a work in 10 days, Y and Z in 12 days and X and Z in 15 days. What will be the ratio of efficiency of X, Y and Z respectively?
A.	10 : 12 : 15
B.	6 : 5 : 4
C.	5 : 7 : 3
D.	5 : 6 : 4
Answer» D. 5 : 6 : 4

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