Question

X, Y and E can do piece of work in 24, 30 and 40 days respectively. All three began to work together but X and Y left 6 and 8 days respectively before completion of the work. In how many days was the work completed?

A 12(5/12) days
B 15(1/6) days
C 4(7/12) days
D 6(7/12) days
E None of these
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