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A can do a piece of work in 12 days and B in 18 days. Together they finish it in
A8.4 days
B9.0 days
C6.5 days
D7.2 days
Answer & Solution
Correct answer: D. 7.2 days
Combined rate = 1/12 + 1/18 = 3/36 + 2/36 = 5/36. Time = 36/5 = 7.2 days.
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