A alone can do a certain job in 15 days, while B alone can do it in 10 days. A started the work and was joined by B after 5 days. The work lasted for how many days ?

A alone can do a certain job in 15 days, while B alone can do it in 10

1.	A alone can do a certain job in 15 days, while B alone can do it in 10 days. A started the work and was joined by B after 5 days. The work lasted for how many days ?
A.	4
B.	8
C.	5
D.	9
E.	None of the above
Answer» E. None of the above

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A alone can do a certain job in 15 days, while B alone can do it in 10 days. A started the work and was joined by B after 5 days. The work lasted for how many days ?

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