Question
A can finish a task in 9 days which B can finish in 12
days. In how many days they can finish if they work together?Solution
A’s 1 day work = 1/9
B’s 1 day work = 1/12
Together in 1 day = 1/9 + 1/12 = (4 + 3)/36 = 7/36
So total time = 36/7 = 5 1/7 days ≈ 5.14 days
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