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Multiple Choice Questions

X Y and Z take 18 days to complete a piece of work If X works alone he finishes the work in 36 days ...........

Quantitative Aptitude (RRB NTPC) Time and work

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X, Y and Z take 18 days to complete a piece of work. If X works alone he finishes the work in 36 days and if Y works alone he finishes it in 60 days. How long will it take Z to complete the work alone?

78 days

90 days

96 days

114 days

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Explanation:

X--36

Y--60

X+Y+Z---18

Efficiency of Z = 10-5-3

Z=2

∴ Time = 180/2=90 days

By: Barka Mirza

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