Quantitative Aptitude :: Time and Work - Discussion

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Explanation:
x can do 1/4 of work in = 10 days
so x can do whole work in = (10 x 4) = 40 days.

Y can do (40% or 40/100)of work in = 40 days
so Whole work can be done by Y = (40x100/40)= 100 days.

Z can do 1/3 of work in = 13 days
Whole work will be done by Z in (13 x 3) = 39 days.

so compare x , y ,z work compare = y > x > z
so Z can complete the work first.