alleryA can do a piece of work in 20 days, B in 30 days. Together they can do it in
A15 days
B10 days
C12 days
D14 days
Answer & Solution
Correct answer: C. 12 days
Combined rate = 1/20 + 1/30 = 3/60 + 2/60 = 5/60 = 1/12. Time = 12 days.
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