A and B can do a work in 20days, B and C can do it in 30days; A,B and C together can finish it in ...

A and B can do a work in 20days, B and C can do it in 30days; A,B and C together can finish it in 40days. A and C together will do it in?

Quiz

Answer/Solution

30days

Steps/Work

A+B+C 1day work = 1/40
A+B 1day work = 1/20
B+C 1day work = 1/30
A+C 1day work = 2*1/40 - 1/20+1/30 = 1/30
A and C together will do the work in 30 days.
Answer is B

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A and b can do a work in days, b and c can do it in days ; a, b and c together can finish it in days. A and c together will do it in?

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