A alone can complete a assignment in 12 days & B alone can complete the same assingment in 24 days. In how many days can A & B together complete the same assingment ?
[Bank Clerks 2009]
Explanation
According to the question,
A's 1 day work = 1/12
B's 1 day work = 1/24
(A+B's 1 day work)
∴ (A+B) will finish the assingment in 8 days.
Hence option D is correct.
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