A can do a piece of work in 20 days and B in 15 days. With help of C, they finish the work in 5 days. In how many days C alone can do the same work ?

A can do a piece of work in 20 days and B in 15 days. With help of C,

1.	A can do a piece of work in 20 days and B in 15 days. With help of C, they finish the work in 5 days. In how many days C alone can do the same work ?
A.	days
B.	days
C.	0 days
D.	2 days
Answer» E.