1.

A and B can do a work in 12 days. B and C in 15 days. C and A in 20 days. If A, B and C work together, they will complete the work in

A.  5 days                         
B.  \[7\frac{5}{6}\]days        
C.  10 days  
D.  \[15\frac{2}{3}\]days
Answer» D.  \[15\frac{2}{3}\]days


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