12. A and B can do a piece of work in 40 days; B and C in 30 days; and C and A in 24 days.
(i) How long will it take them to do the work together ? (ii) In what time can each finish it working alone ?
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Answer:Given : A and B can do a piece of work in 40 days, B and C in 30 days and C and A in 24 days. To find : In what time can each finish it working alone? Together they take A+B+C= 20 days
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