question_answer

P and Q can do a job in 2 days; Q and R can do it in 4 days; P and R in \[2\frac{2}{5}\] days. What is the number of days in which P alone will do the job?

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

B)  3

C)  \[2\frac{4}{5}\]                                               

D)  6