X can do a piece of work in 24 days. When he had worked for 4 days, Y joined him. If complete work was finished in 16 days, Y can alone finish that work in ?

X can do a piece of work in 24 days. When he had worked for 4 days, Y

1.	X can do a piece of work in 24 days. When he had worked for 4 days, Y joined him. If complete work was finished in 16 days, Y can alone finish that work in ?
A.	7 days
B.	6 days
C.	2 days
D.	8 days
Answer» C. 2 days