A and B can do a piece of work in 36 days, B and C can do it in 60 days, A and C can do it in 45 days, C alone can do it in

A and B can do a piece of work in 36 days, B and C can do it in 60 days, A and C can do it in 45 days, C alone can do it in
1). 90 days
2). 180 days
3). 120 days
4). 150 days

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