2009 · Q99
P and Q can do a job in 2 days: Q and R can do it in 4 days; and P and R in 12/5 days. What is the number of days required for P alone to do the job?
Elementary MathematicsAlgebra
- A5/2
- B3
- C14/5
- D6
Explanation
P = 1/3 per day; 3 days alone.