A and B can do a piece of work in 72 days; B and C can do it in 120 days; A and C can do it in 90 days. In what time can A alone do it ?

A and B can do a piece of work in 72 days; B and C can do it in 120 d

1.	A and B can do a piece of work in 72 days; B and C can do it in 120 days; A and C can do it in 90 days. In what time can A alone do it ?
A.	80 days
B.	100 days
C.	120 days
D.	150 days
Answer» D. 150 days

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A and B can do a piece of work in 72 days; B and C can do it in 120 days; A and C can do it in 90 days. In what time can A alone do it ?

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