"X can do a piece of work in 40 days. He works at it for 8 days and then
Channel: Doubtnut
Date: 2020-04-05

"X can do a piece of work in 40 days. He works at
 it for 8 days and then Y finished it in 16 days. How long will they together
 take to complete the work ? 
`13 1/3\ d a y s`
b. `15\ d a y s`
c. `20\ d a y s`
d. `56\ d a y s`"