question_answer

Robert can finish the writing of the book in 8 days while James can finish the same work in 10 days. If they work together then how long they will take to finish the same work?

A)  \[10\frac{1}{2}\] days              

B)  \[6\frac{2}{3}\] days

C)   \[\frac{4}{9}\] days                 

D)  \[4\frac{4}{9}\] days

E)  None of these