Question

3. A and B can do a job in 6 days, B and C in 9 days, and A and C in 12 days. How much time
will they take to complete the job if they all work together? How long will each of them take
to do the job?​

Answer 1

Answer:

1/A + 1/B=1/6

1/B + 1/C=1/9

1/A + 1/C=1/12

2/A + 2/B + 2/C=1/6 + 1/9 + 1/12

=6+4+3 / 36

=13/36

1/A + 1/B + 1/C=13/72

1 / 1/A + 1/B + 1/C=72/13 days for all 3 together

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Answer 2

Answer:

AB=6 days-A=3 days and B=3 days

BC=9 days-B=3 days(we got it from above)then C=6days

AC=12 days-A=3 days C=6 days

now....ABC=18 days will needed