A can do a piece of work in 15 days which B alone can do in 10 days. A started the work and B joined him after 5 days. Find the number of days taken to complete the work.

A can do a piece of work in 15 days which B alone can do in 10 days. A

1.	A can do a piece of work in 15 days which B alone can do in 10 days. A started the work and B joined him after 5 days. Find the number of days taken to complete the work.
A.	4 days
B.	9 days
C.	10 days
D.	15 days
Answer» C. 10 days

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A can do a piece of work in 15 days which B alone can do in 10 days. A started the work and B joined him after 5 days. Find the number of days taken to complete the work.

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