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A can do a piece of work in 12 days and B in 18 days. Working together they will complete the work in
A10 days
B7.2 days
C7.5 days
D8 days
Answer & Solution
Correct answer: B. 7.2 days
A's rate = 1/12 per day, B's rate = 1/18 per day. Together: 1/12 + 1/18 = 3/36 + 2/36 = 5/36. Time = 36/5 = 7.2 days.
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