A and B can do piece of work in 12 days;...

A and B can do piece of work in 12 days; B and C in 15 days; C and A in 20 days. In how many days will they finish it together and separately ?

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A and B can finish a piece of work in 12 days, B and C in 15 days shile C and A in 20 days. How long will they take to finish it together ? How long will each take to finish the work alone ?

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