A and B can do a piece of work in 30 days ,B and C in 24 days , C and A in 40days . How long it will take them to do the work together ??
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A+B ONE DAY WORK=1/30
B+C ONE DAY WORK=1/24
C+A ONE DAY WORK=1/40
ADD ALL OF THEM
2(A+B+C)=1/40+1/30+1/24
A+B+C=1/20
20 DAYS
B+C ONE DAY WORK=1/24
C+A ONE DAY WORK=1/40
ADD ALL OF THEM
2(A+B+C)=1/40+1/30+1/24
A+B+C=1/20
20 DAYS
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