A and B can do a piece of work in 10 hours. b and c in 12 hours and c and a in 15 hours. how long will they take if they work together? how long will each take to complete the work independently?
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A and B do a piece of work in one hour 1/10
B and C do a piece work in one hour 1/12
C and A do a piece work in one hour 1/15
2(A+B+C) do ". ". " 1/10+ 1/12+1/15
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