2013 · Q4
'X' can complete a job in 12 days. If 'X' and 'Y' work together, they can complete the job in 6 2/3 days. 'Y' alone can complete the job in
Elementary MathematicsArithmetic
- A15 days
- B12 days
- C15 days
- D18 days
Explanation
1/y = 1/(20/3) − 1/12 = 3/20 − 1/12 = 1/15, so y = 15 days. Answer C.