1.

A can do a work in 4 days, B can do it in 5 days and C can do it in 10 days. A, B and C together can do the work in

Answer»

1 9/11 days



When A, B and C can do a WORK in x, y and Z days RESPECTIVELY. Then, the three of them 

together can finish the work in xyz/ x y + y z + x z days 

That is, A, B and C together ca do the work in 4 × 5 × 10/ 20 + 50 + 40 

= 4 × 5 × 10/110 = 20/11 = 1 9/11 days.



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